Shafiul Ferdous - Academia.edu (original) (raw)

Papers by Shafiul Ferdous

Journal of High Pressure Institute of Japan, 2013

Key Engineering Materials, 2020

The fatigue strengths in notched specimens of carbon-carbon composites were investigated. Slits o... more The fatigue strengths in notched specimens of carbon-carbon composites were investigated. Slits of different length were cut on both sides of a test section to investigate the impact of notch sensitivity on fatigue life. Specimens with blunt-notches on the both side of the specimen, and center hole were also used to compare the critical stress, sw. The fatigue limit was measured using S-N curves. From the experimental result, it was found that specimens with blunt-notches have lowest fatigue limit. The relationships between critical stress, sw and specimen geometry were investigated by stress concentration factor, Kt and stress intensity factor, KI which was done two dimensional body forced methods. Consequently, it was discussed that the damage condition in the vicinity of the notch or slit, and the crack initiation behavior affects the fatigue strength. Also, the S-N curve and fatigue limit was related to the crack growth in shear mode.

Key Engineering Materials, 2018

The crack growth can accelerate after applying unexpected overload or underload during usual oper... more The crack growth can accelerate after applying unexpected overload or underload during usual operation of machine structure. An acceleration or deceleration of the crack growth was observed depending on the experimental conditions. In the present study, a method of detecting the application of an unexpected hazardous load, that is high levels of overload or underload, was investigated. It is expected that the acceleration of crack growth brings catastrophic failure in machine structure. Therefore, it is useful for machine maintenance to know whether an unexpected load was applied or not by doing daily inspection. In the present study by using center-crack specimens, a simple method of detecting application of overload or underload was investigated by using strain information.

Key Engineering Materials, 2020

The fatigue limit and fracture behavior of epoxy carbon fiber reinforced composites and hybrid co... more The fatigue limit and fracture behavior of epoxy carbon fiber reinforced composites and hybrid composites were investigated. An aluminum foil and thin aluminum plate were incorporated with the carbon fiber to make the hybrid reinforced composites. Several specimens were prepared, and a series of tests were carried out to investigate the fatigue life and fracture behavior. Then the results were compared among epoxy carbon fiber reinforced composites and the hybrid composites. It is discussed whether the S–N curves shows almost the similar characteristics of these two types of hybrid composites or not. As far as the present result, the stress ratio and the type of hybrid composites effect on the fatigue life. The interfacial bonding plays an important role in the strength and fracture behavior of notched specimen of the fabricated composites.

IOP Conference Series: Materials Science and Engineering, 2018

The fatigue strengths in notched specimens of carbon fiber reinforced carbon composites (C/C comp... more The fatigue strengths in notched specimens of carbon fiber reinforced carbon composites (C/C composites) were investigated. The fatigue limit was measured by S-N curves and load increase tests. The value of fatigue limit obtained by those methods was almost the same. Slits of several sizes were cut on both sides of a test section, and different sizes of slit length were chosen. Also, specimens with blunt-notches were used to compare the fatigue strength. The weakest fatigue limit was obtained in the case of specimens with blunt-notches. However, the stress concentration factor of those is smaller than that of slit specimens. The relationships between fatigue strengths and specimen shapes were analyzed by stress distribution. The effect of slit configuration on fatigue strength was then discussed regarding the experimental consequences. Consequently, it was discussed that the fatigue strength of the present specimens was determined depending on the damage conditions in the vicinity of the notch and on the crack initiation behavior. It is expected that the tendency of the S-N curve and fatigue limit was related to the shear damage and shear mode of the crack growth.

The Proceedings of Mechanical Engineering Congress, Japan, 2017

When an unexpected overload or underload was applied a cracked material during usual operation un... more When an unexpected overload or underload was applied a cracked material during usual operation under constant stress amplitude, an acceleration or deceleration of the crack growth was observed depending on the experimental conditions. In the present study, a method of detecting the application of an unexpected dangerous load was investigated. In some cases, the acceleration of crack growth brings catastrophic failure in machine structure. Therefore, it is useful for machine maintenance to know whether an unexpected load was applied or not by doing daily inspection. In the present study by using center-crack specimen, a simple method of detecting application of overload or underload was investigated.

IOP Conference Series: Materials Science and Engineering, 2019

A special type of jute fiber woven mat was introduced by a hand loom. Epoxy jute fiber composites... more A special type of jute fiber woven mat was introduced by a hand loom. Epoxy jute fiber composites were fabricated using the woven fiber mat. A series of jute-hybrid epoxy composites based on the arrangement of the direction of jute fibers, and additional material were introduced to ensure the elevated mechanical properties of the composites. Improved mechanical properties were found in some cases of hybrid epoxy composites. It is discussed that the mechanical behavior is related to the fiber orientation, types of additional materials used in hybrid materials. The purpose of this study is to propose a simple technical method to prepare woven jute fiber mat by hand loom, and to produce epoxy jute fiber, hybrid composite materials to exhibit the elevated mechanical properties.

International Journal of Engineering Materials and Manufacture, 2017

Aluminium matrix composites (AMCs) used extensively in various engineering fields due to their ex... more Aluminium matrix composites (AMCs) used extensively in various engineering fields due to their exceptional mechanical properties. In this present study, aluminium matrix composites (AMCs) such as aluminium alloy (A356) reinforced with rice husk ash particles (RHA) are made to explore the possibilities of reinforcing aluminium alloy. The stir casting method was applied to produce aluminium alloy (A356) reinforced with various amounts of (2%, 4%, and 6%) rice husk ash (RHA) particles. Physical treatment was carried out before the rice husk ash manufacturing process. The effect of mechanical strength of the fabricated hybrid composite was investigated. Therefore, impact test, tensile stress, compressive stress, and some other tests were carried out to analyse the mechanical properties. From the experimental results, it was found that maximum tensile, and compressive stress were found at 6% rice husk ash (RHA) and aluminium matrix composites (AMCs). In future, the optimum percentages of...

Materials Science Forum, 2018

The fatigue limit and crack growth behavior of slit specimens of carbon fiber reinforced epoxy co... more The fatigue limit and crack growth behavior of slit specimens of carbon fiber reinforced epoxy composites were investigated. The fatigue limit was defined by the maximum stress amplitude that the specimen endured 106 times repeated stress when S-N curve was used. The highest fatigue limit was obtained when all the fiber directions were parallel to the load axis. The fatigue limits were evaluated in the cases of composites using alternately parallel and perpendicular to the load axis and compared with the result of the specimen having all the carbon fiber orientations were parallel to the load axis. When the measured value of the fatigue limit was lower, shear damage to the epoxy resin and peeling of fiber from epoxy resin occurred clearly. According to those results, it was expected that the fatigue limit of smooth specimens of carbon composites with long fibers can be evaluated from the results of the slit specimens.

Advances in Materials Science and Applications, 2017

A method for detecting the application of an unexpected dangerous load was investigated. An accel... more A method for detecting the application of an unexpected dangerous load was investigated. An acceleration behavior of crack growth due to the application of overload and or underload during fatigue crack growth test with constant stress amplitude was observed. In some cases, the acceleration of crack growth brings catastrophic failure in machine structure. Therefore, it is useful for machine maintenance to know whether an unexpected load was applied or not by doing a daily inspection. In the present study by using center-crack specimen, a simple method of detecting the application of overload or underload was investigated. Such an unexpected load can be detected by the waveform of the function of stress and strain in the vicinity of the crack.

The Proceedings of the Materials and Mechanics Conference, 2013

The fatigue and f ヤ actUre behavior of CIC composites fabricated using fine − woven carbon fiber ... more The fatigue and f ヤ actUre behavior of CIC composites fabricated using fine − woven carbon fiber Iaminates with cr ＝ O／ 90D direc 匠on were lnvestlgated ． Thc effeCt of the slit oonfiguration on crack initiation and grow し h behavior was observ ◎d ． Specimens with blunt − notches and centcr − holes were also used to compare 山 e fatigue strength and crack growth bchavior ． Non − propagating cracks were observed and fatigue limit was defined as the maximum strcss at which specimen did not break fbr 八同 07cycles stress application ． The longest fatigue iife was obtained in the case of specimens with sho 腔 er slits． The relationships between fatigue strengths and specimen shapes were analyzed by stress concentration ， K ， and stress intensity factor ， Kr． The effect of slit configuration on fatigue strength was then discussed regarding both the experimental and calculated consequences ． Key 凧)'廊 ： Fatiguc limit ， Crack initiation ， Crack growth， Stress concentration ， Stress intensity ．

The Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics, 2015

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A, 2010

International Journal of Modern Physics: Conference Series, 2012

The effects of an overload on fatigue crack growth behavior have been investigated by using carbo... more The effects of an overload on fatigue crack growth behavior have been investigated by using carbon steel. Delayed retardation and acceleration of crack growth were both observed. These phenomena depended not only on overload conditions but also on the baseline stress conditions. Moreover, the mechanical properties of the materials affected the crack growth rate after overload. It was found that crack growth accelerated when tensile residual stress was distributed in front of the crack tip. The residual stress distribution is related to the crack opening geometry at the overload stage.

Surface Review and Letters, 2017

The fatigue crack initiation life and growth rate are affected by experimental conditions. A corr... more The fatigue crack initiation life and growth rate are affected by experimental conditions. A corrosive environment can be created in a laboratory by means of dropping salt water onto the specimen surface, spraying chloride mist into the experimental chamber, etc. In the case of smooth specimens of some metals, fatigue life is shortened and the fatigue limit disappears under such corrosive experimental conditions. In this study, the effects of intermittent spraying of 3% NaCl solution-mist on corrosion fatigue behavior were investigated. The material used was 0.37% carbon steel. This is called JIS S35C in Japan. Spraying of 3% NaCl solution-mist attacked the surface layer of the specimen. It is well known that the pitting, oxidation–reduction reaction, etc. affect the fatigue strength of metals in a corrosive environment. We carried out corrosion fatigue tests with smooth specimens, holed specimens and slit specimens. Then the effects of such specimen geometry on the fatigue strength...

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A, 2013

Many cracks are initiated at a production facility of cars. So, stop-holes are drilled at crack t... more Many cracks are initiated at a production facility of cars. So, stop-holes are drilled at crack tips to reduce the stress concentration. However that method does not work to prevent the crack growth. That facility will be renovated next year, so some other method of arresting crack growth should be found before the renovation. Because of this situation, we investigate a method of preventing crack growth by using a crack arrester. Before installing the crack arrester in the production facility, we carried out experiments in a laboratory. It was confirmed that the crack arrester works well to prevent crack growth. Then, the crack arrester was used to prevent crack growth in the production facility. In this paper, the experimental results in the laboratory are introduced, and the effectiveness of the crack arrester to prevent fatigue crack growth is shown.

Journal of High Pressure Institute of Japan, 2013

Key Engineering Materials, 2020

The fatigue strengths in notched specimens of carbon-carbon composites were investigated. Slits o... more The fatigue strengths in notched specimens of carbon-carbon composites were investigated. Slits of different length were cut on both sides of a test section to investigate the impact of notch sensitivity on fatigue life. Specimens with blunt-notches on the both side of the specimen, and center hole were also used to compare the critical stress, sw. The fatigue limit was measured using S-N curves. From the experimental result, it was found that specimens with blunt-notches have lowest fatigue limit. The relationships between critical stress, sw and specimen geometry were investigated by stress concentration factor, Kt and stress intensity factor, KI which was done two dimensional body forced methods. Consequently, it was discussed that the damage condition in the vicinity of the notch or slit, and the crack initiation behavior affects the fatigue strength. Also, the S-N curve and fatigue limit was related to the crack growth in shear mode.

Key Engineering Materials, 2018

The crack growth can accelerate after applying unexpected overload or underload during usual oper... more The crack growth can accelerate after applying unexpected overload or underload during usual operation of machine structure. An acceleration or deceleration of the crack growth was observed depending on the experimental conditions. In the present study, a method of detecting the application of an unexpected hazardous load, that is high levels of overload or underload, was investigated. It is expected that the acceleration of crack growth brings catastrophic failure in machine structure. Therefore, it is useful for machine maintenance to know whether an unexpected load was applied or not by doing daily inspection. In the present study by using center-crack specimens, a simple method of detecting application of overload or underload was investigated by using strain information.

Key Engineering Materials, 2020

The fatigue limit and fracture behavior of epoxy carbon fiber reinforced composites and hybrid co... more The fatigue limit and fracture behavior of epoxy carbon fiber reinforced composites and hybrid composites were investigated. An aluminum foil and thin aluminum plate were incorporated with the carbon fiber to make the hybrid reinforced composites. Several specimens were prepared, and a series of tests were carried out to investigate the fatigue life and fracture behavior. Then the results were compared among epoxy carbon fiber reinforced composites and the hybrid composites. It is discussed whether the S–N curves shows almost the similar characteristics of these two types of hybrid composites or not. As far as the present result, the stress ratio and the type of hybrid composites effect on the fatigue life. The interfacial bonding plays an important role in the strength and fracture behavior of notched specimen of the fabricated composites.

IOP Conference Series: Materials Science and Engineering, 2018

The fatigue strengths in notched specimens of carbon fiber reinforced carbon composites (C/C comp... more The fatigue strengths in notched specimens of carbon fiber reinforced carbon composites (C/C composites) were investigated. The fatigue limit was measured by S-N curves and load increase tests. The value of fatigue limit obtained by those methods was almost the same. Slits of several sizes were cut on both sides of a test section, and different sizes of slit length were chosen. Also, specimens with blunt-notches were used to compare the fatigue strength. The weakest fatigue limit was obtained in the case of specimens with blunt-notches. However, the stress concentration factor of those is smaller than that of slit specimens. The relationships between fatigue strengths and specimen shapes were analyzed by stress distribution. The effect of slit configuration on fatigue strength was then discussed regarding the experimental consequences. Consequently, it was discussed that the fatigue strength of the present specimens was determined depending on the damage conditions in the vicinity of the notch and on the crack initiation behavior. It is expected that the tendency of the S-N curve and fatigue limit was related to the shear damage and shear mode of the crack growth.

The Proceedings of Mechanical Engineering Congress, Japan, 2017

When an unexpected overload or underload was applied a cracked material during usual operation un... more When an unexpected overload or underload was applied a cracked material during usual operation under constant stress amplitude, an acceleration or deceleration of the crack growth was observed depending on the experimental conditions. In the present study, a method of detecting the application of an unexpected dangerous load was investigated. In some cases, the acceleration of crack growth brings catastrophic failure in machine structure. Therefore, it is useful for machine maintenance to know whether an unexpected load was applied or not by doing daily inspection. In the present study by using center-crack specimen, a simple method of detecting application of overload or underload was investigated.

IOP Conference Series: Materials Science and Engineering, 2019

A special type of jute fiber woven mat was introduced by a hand loom. Epoxy jute fiber composites... more A special type of jute fiber woven mat was introduced by a hand loom. Epoxy jute fiber composites were fabricated using the woven fiber mat. A series of jute-hybrid epoxy composites based on the arrangement of the direction of jute fibers, and additional material were introduced to ensure the elevated mechanical properties of the composites. Improved mechanical properties were found in some cases of hybrid epoxy composites. It is discussed that the mechanical behavior is related to the fiber orientation, types of additional materials used in hybrid materials. The purpose of this study is to propose a simple technical method to prepare woven jute fiber mat by hand loom, and to produce epoxy jute fiber, hybrid composite materials to exhibit the elevated mechanical properties.

International Journal of Engineering Materials and Manufacture, 2017

Aluminium matrix composites (AMCs) used extensively in various engineering fields due to their ex... more Aluminium matrix composites (AMCs) used extensively in various engineering fields due to their exceptional mechanical properties. In this present study, aluminium matrix composites (AMCs) such as aluminium alloy (A356) reinforced with rice husk ash particles (RHA) are made to explore the possibilities of reinforcing aluminium alloy. The stir casting method was applied to produce aluminium alloy (A356) reinforced with various amounts of (2%, 4%, and 6%) rice husk ash (RHA) particles. Physical treatment was carried out before the rice husk ash manufacturing process. The effect of mechanical strength of the fabricated hybrid composite was investigated. Therefore, impact test, tensile stress, compressive stress, and some other tests were carried out to analyse the mechanical properties. From the experimental results, it was found that maximum tensile, and compressive stress were found at 6% rice husk ash (RHA) and aluminium matrix composites (AMCs). In future, the optimum percentages of...

Materials Science Forum, 2018

The fatigue limit and crack growth behavior of slit specimens of carbon fiber reinforced epoxy co... more The fatigue limit and crack growth behavior of slit specimens of carbon fiber reinforced epoxy composites were investigated. The fatigue limit was defined by the maximum stress amplitude that the specimen endured 106 times repeated stress when S-N curve was used. The highest fatigue limit was obtained when all the fiber directions were parallel to the load axis. The fatigue limits were evaluated in the cases of composites using alternately parallel and perpendicular to the load axis and compared with the result of the specimen having all the carbon fiber orientations were parallel to the load axis. When the measured value of the fatigue limit was lower, shear damage to the epoxy resin and peeling of fiber from epoxy resin occurred clearly. According to those results, it was expected that the fatigue limit of smooth specimens of carbon composites with long fibers can be evaluated from the results of the slit specimens.

Advances in Materials Science and Applications, 2017

A method for detecting the application of an unexpected dangerous load was investigated. An accel... more A method for detecting the application of an unexpected dangerous load was investigated. An acceleration behavior of crack growth due to the application of overload and or underload during fatigue crack growth test with constant stress amplitude was observed. In some cases, the acceleration of crack growth brings catastrophic failure in machine structure. Therefore, it is useful for machine maintenance to know whether an unexpected load was applied or not by doing a daily inspection. In the present study by using center-crack specimen, a simple method of detecting the application of overload or underload was investigated. Such an unexpected load can be detected by the waveform of the function of stress and strain in the vicinity of the crack.

The Proceedings of the Materials and Mechanics Conference, 2013

The fatigue and f ヤ actUre behavior of CIC composites fabricated using fine − woven carbon fiber ... more The fatigue and f ヤ actUre behavior of CIC composites fabricated using fine − woven carbon fiber Iaminates with cr ＝ O／ 90D direc 匠on were lnvestlgated ． Thc effeCt of the slit oonfiguration on crack initiation and grow し h behavior was observ ◎d ． Specimens with blunt − notches and centcr − holes were also used to compare 山 e fatigue strength and crack growth bchavior ． Non − propagating cracks were observed and fatigue limit was defined as the maximum strcss at which specimen did not break fbr 八同 07cycles stress application ． The longest fatigue iife was obtained in the case of specimens with sho 腔 er slits． The relationships between fatigue strengths and specimen shapes were analyzed by stress concentration ， K ， and stress intensity factor ， Kr． The effect of slit configuration on fatigue strength was then discussed regarding both the experimental and calculated consequences ． Key 凧)'廊 ： Fatiguc limit ， Crack initiation ， Crack growth， Stress concentration ， Stress intensity ．

The Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics, 2015

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A, 2010

International Journal of Modern Physics: Conference Series, 2012

The effects of an overload on fatigue crack growth behavior have been investigated by using carbo... more The effects of an overload on fatigue crack growth behavior have been investigated by using carbon steel. Delayed retardation and acceleration of crack growth were both observed. These phenomena depended not only on overload conditions but also on the baseline stress conditions. Moreover, the mechanical properties of the materials affected the crack growth rate after overload. It was found that crack growth accelerated when tensile residual stress was distributed in front of the crack tip. The residual stress distribution is related to the crack opening geometry at the overload stage.

Surface Review and Letters, 2017

The fatigue crack initiation life and growth rate are affected by experimental conditions. A corr... more The fatigue crack initiation life and growth rate are affected by experimental conditions. A corrosive environment can be created in a laboratory by means of dropping salt water onto the specimen surface, spraying chloride mist into the experimental chamber, etc. In the case of smooth specimens of some metals, fatigue life is shortened and the fatigue limit disappears under such corrosive experimental conditions. In this study, the effects of intermittent spraying of 3% NaCl solution-mist on corrosion fatigue behavior were investigated. The material used was 0.37% carbon steel. This is called JIS S35C in Japan. Spraying of 3% NaCl solution-mist attacked the surface layer of the specimen. It is well known that the pitting, oxidation–reduction reaction, etc. affect the fatigue strength of metals in a corrosive environment. We carried out corrosion fatigue tests with smooth specimens, holed specimens and slit specimens. Then the effects of such specimen geometry on the fatigue strength...

TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A, 2013

Many cracks are initiated at a production facility of cars. So, stop-holes are drilled at crack t... more Many cracks are initiated at a production facility of cars. So, stop-holes are drilled at crack tips to reduce the stress concentration. However that method does not work to prevent the crack growth. That facility will be renovated next year, so some other method of arresting crack growth should be found before the renovation. Because of this situation, we investigate a method of preventing crack growth by using a crack arrester. Before installing the crack arrester in the production facility, we carried out experiments in a laboratory. It was confirmed that the crack arrester works well to prevent crack growth. Then, the crack arrester was used to prevent crack growth in the production facility. In this paper, the experimental results in the laboratory are introduced, and the effectiveness of the crack arrester to prevent fatigue crack growth is shown.