zeeshan anjum - Academia.edu (original) (raw)

Papers by zeeshan anjum

Research paper thumbnail of Determination of Fretting Fatigue Behavior in Titanium Alloy Ti-6Al-4V: A review

5 Abstract-Fretting fatigue is an important concern in the structures and machine parts that are ... more 5 Abstract-Fretting fatigue is an important concern in the structures and machine parts that are subjected to repeated relative movements between them. In current study a review of the work done by various researchers related to the evaluation of fretting fatigue response of Ti-6Al-4V has been presented. Effects of surface treatments, crack growth, heat treatments, types of loading, contact pad configuration on the fretting fatigue life have been presented. Life prediction models developed by various researchers have also been discussed.

Research paper thumbnail of Effect of chrome plating and varying hardness on the fretting fatigue life of AISI D2 components

Wear, 2018

Effect of commercial grade chrome plating on the fretting fatigue life of AISI D2 is investigated... more Effect of commercial grade chrome plating on the fretting fatigue life of AISI D2 is investigated using recently developed inverted pin-in-dovetail configuration fixture. Chrome plated and non-plated specimens having hardness of 40, 43, 52, 57 and 62 HRC were tested. All samples were tested at 7.5 kN tension-tension axial load (R = 0.1) at a constant frequency of 20 Hz and were observed under optical microscope after specific number of cycles to record crack initiation and crack propagation. It was observed that chrome plating is ineffective when component hardness is low but improves the fretting fatigue life by 60% when component hardness is 62 HRC. SEM images give an insight of how chrome plating plays an effective role in improving fretting fatigue life.

Research paper thumbnail of Effect of various surface preparation techniques on the delamination properties of vacuum infused Carbon fiber reinforced aluminum laminates (CARALL): Experimentation and numerical simulation

Journal of Mechanical Science and Technology, 2017

Carbon fiber reinforced aluminum laminates (CARALL) are one of the aluminum based Fiber metal lam... more Carbon fiber reinforced aluminum laminates (CARALL) are one of the aluminum based Fiber metal laminates (FMLs) which, due to their high strength to weight ratio and good impact resistance are greatly replacing aluminum alloys in aircraft structures. In this research work, interlaminate shear strength of Vacuum assisted resin transfer molding (VARTM) manufactured CARALL has been investigated. Numerical simulation model incorporated with real time material data has been developed to predict the delamination behavior of CARALL laminates. Standard CARALL specimens with different surface morphologies were prepared by electric discharge machining, mechanical, chemical and electrochemical surface treatments. T-peel tests were carried out according to standard ASTM D1876-08 to find out inter laminate shear strength. FMLs made out of mechanically, chemically and electrochemically cleaned metal sheets depicted high interlaminate shear strength. SEM micrographs of failed surfaces verify the high adhesive strength of epoxy. Developed numerical simulation model accurately predicts the delamination behavior of CARALL as observed during experimentation.

Research paper thumbnail of Investigation of Electrical Properties & Mechanical Quality Factor of Piezoelectric Material (PZT-4A)

Journal of Electrical Engineering and Technology, 2017

Piezoelectricity is the capability of a piezoelectric material to change mechanical energy into e... more Piezoelectricity is the capability of a piezoelectric material to change mechanical energy into electrical energy. The determination of electrical and mechanical properties plays a significant role in characterizing the piezoelectric material. The energy losses characteristics of piezoelectric material can be described by mechanical quality factor. In this paper, the output voltage and mechanical quality factor of Lead Zirconate Titanate (PZT-4A) piezoelectric material is determined under various resistance and loading conditions by using the test setup. The commercial FEM software ABAQUS is used to analyze the performance of piezoelectric material under static loading conditions. It is observed that these properties affect the performance of a material particularly in the designing of smart structures. The experimental results are partially compared to the simulation values.

Research paper thumbnail of Generation of electrical energy using lead zirconate titanate (PZT-5A) piezoelectric material: Analytical, numerical and experimental verifications

Journal of Mechanical Science and Technology, 2016

Energy harvesting is the process of attaining energy from the external sources and transforming i... more Energy harvesting is the process of attaining energy from the external sources and transforming it into usable electrical energy. An analytical model of piezoelectric energy harvester has been developed to determine the output voltage across an electrical circuit when it is forced to undergo a base excitation. This model gives an easy approach to design and investigate the behavior of piezoelectric material. Numerical simulations have been carried out to determine the effect of frequency and loading on a Lead zirconate titanate (PZT-5A) piezoelectric material. It has been observed that the output voltage from the harvester increases when loading increases whereas its resonance frequency decreases. The analytical results were found to be in good agreement with the experimental and numerical simulation results.

Research paper thumbnail of Prediction of non-propagating fretting fatigue cracks in Ti6Al4V sheet tested under pin-in-dovetail configuration: Experimentation and numerical simulation

Materials & Design, 2015

This paper presents the results of fretting fatigue tests carried out on Ti6Al4V sheet specimens ... more This paper presents the results of fretting fatigue tests carried out on Ti6Al4V sheet specimens in contact with carbide rod in a cylinder-on-flat contact configuration. A new methodology of carrying out fretting fatigue experiments is proposed and successfully implemented using a pin-in-dovetail and pin-in-hole configuration. The advantage of this configuration is the simplicity and ease of application. The tests are carried out on MTS 810 at different loads, constant frequency (30 Hz) and ambient conditions. These tests reveal that the crack initiation and propagation are dependent on the applied load and the configuration of the contact. At low loads, non-propagating cracks are observed in the pin-in-dovetail configuration using metallurgical microscope. At high loads these cracks become longer but are still non-propagating. Numerical simulation using elasticplastic material model is carried out to determine stress intensity factor and the mode of crack propagation. Maximum principal stress damage criteria approach is used to predict the crack initiation sites under different loads and a strong correlation with experimental results is observed. The crack propagation is simulated using XFEM, which successfully simulates the non-propagating crack length.

Research paper thumbnail of Determination of Fretting Fatigue Behavior in Titanium Alloy Ti-6Al-4V: A review

5 Abstract-Fretting fatigue is an important concern in the structures and machine parts that are ... more 5 Abstract-Fretting fatigue is an important concern in the structures and machine parts that are subjected to repeated relative movements between them. In current study a review of the work done by various researchers related to the evaluation of fretting fatigue response of Ti-6Al-4V has been presented. Effects of surface treatments, crack growth, heat treatments, types of loading, contact pad configuration on the fretting fatigue life have been presented. Life prediction models developed by various researchers have also been discussed.

Research paper thumbnail of Effect of chrome plating and varying hardness on the fretting fatigue life of AISI D2 components

Wear, 2018

Effect of commercial grade chrome plating on the fretting fatigue life of AISI D2 is investigated... more Effect of commercial grade chrome plating on the fretting fatigue life of AISI D2 is investigated using recently developed inverted pin-in-dovetail configuration fixture. Chrome plated and non-plated specimens having hardness of 40, 43, 52, 57 and 62 HRC were tested. All samples were tested at 7.5 kN tension-tension axial load (R = 0.1) at a constant frequency of 20 Hz and were observed under optical microscope after specific number of cycles to record crack initiation and crack propagation. It was observed that chrome plating is ineffective when component hardness is low but improves the fretting fatigue life by 60% when component hardness is 62 HRC. SEM images give an insight of how chrome plating plays an effective role in improving fretting fatigue life.

Research paper thumbnail of Effect of various surface preparation techniques on the delamination properties of vacuum infused Carbon fiber reinforced aluminum laminates (CARALL): Experimentation and numerical simulation

Journal of Mechanical Science and Technology, 2017

Carbon fiber reinforced aluminum laminates (CARALL) are one of the aluminum based Fiber metal lam... more Carbon fiber reinforced aluminum laminates (CARALL) are one of the aluminum based Fiber metal laminates (FMLs) which, due to their high strength to weight ratio and good impact resistance are greatly replacing aluminum alloys in aircraft structures. In this research work, interlaminate shear strength of Vacuum assisted resin transfer molding (VARTM) manufactured CARALL has been investigated. Numerical simulation model incorporated with real time material data has been developed to predict the delamination behavior of CARALL laminates. Standard CARALL specimens with different surface morphologies were prepared by electric discharge machining, mechanical, chemical and electrochemical surface treatments. T-peel tests were carried out according to standard ASTM D1876-08 to find out inter laminate shear strength. FMLs made out of mechanically, chemically and electrochemically cleaned metal sheets depicted high interlaminate shear strength. SEM micrographs of failed surfaces verify the high adhesive strength of epoxy. Developed numerical simulation model accurately predicts the delamination behavior of CARALL as observed during experimentation.

Research paper thumbnail of Investigation of Electrical Properties & Mechanical Quality Factor of Piezoelectric Material (PZT-4A)

Journal of Electrical Engineering and Technology, 2017

Piezoelectricity is the capability of a piezoelectric material to change mechanical energy into e... more Piezoelectricity is the capability of a piezoelectric material to change mechanical energy into electrical energy. The determination of electrical and mechanical properties plays a significant role in characterizing the piezoelectric material. The energy losses characteristics of piezoelectric material can be described by mechanical quality factor. In this paper, the output voltage and mechanical quality factor of Lead Zirconate Titanate (PZT-4A) piezoelectric material is determined under various resistance and loading conditions by using the test setup. The commercial FEM software ABAQUS is used to analyze the performance of piezoelectric material under static loading conditions. It is observed that these properties affect the performance of a material particularly in the designing of smart structures. The experimental results are partially compared to the simulation values.

Research paper thumbnail of Generation of electrical energy using lead zirconate titanate (PZT-5A) piezoelectric material: Analytical, numerical and experimental verifications

Journal of Mechanical Science and Technology, 2016

Energy harvesting is the process of attaining energy from the external sources and transforming i... more Energy harvesting is the process of attaining energy from the external sources and transforming it into usable electrical energy. An analytical model of piezoelectric energy harvester has been developed to determine the output voltage across an electrical circuit when it is forced to undergo a base excitation. This model gives an easy approach to design and investigate the behavior of piezoelectric material. Numerical simulations have been carried out to determine the effect of frequency and loading on a Lead zirconate titanate (PZT-5A) piezoelectric material. It has been observed that the output voltage from the harvester increases when loading increases whereas its resonance frequency decreases. The analytical results were found to be in good agreement with the experimental and numerical simulation results.

Research paper thumbnail of Prediction of non-propagating fretting fatigue cracks in Ti6Al4V sheet tested under pin-in-dovetail configuration: Experimentation and numerical simulation

Materials & Design, 2015

This paper presents the results of fretting fatigue tests carried out on Ti6Al4V sheet specimens ... more This paper presents the results of fretting fatigue tests carried out on Ti6Al4V sheet specimens in contact with carbide rod in a cylinder-on-flat contact configuration. A new methodology of carrying out fretting fatigue experiments is proposed and successfully implemented using a pin-in-dovetail and pin-in-hole configuration. The advantage of this configuration is the simplicity and ease of application. The tests are carried out on MTS 810 at different loads, constant frequency (30 Hz) and ambient conditions. These tests reveal that the crack initiation and propagation are dependent on the applied load and the configuration of the contact. At low loads, non-propagating cracks are observed in the pin-in-dovetail configuration using metallurgical microscope. At high loads these cracks become longer but are still non-propagating. Numerical simulation using elasticplastic material model is carried out to determine stress intensity factor and the mode of crack propagation. Maximum principal stress damage criteria approach is used to predict the crack initiation sites under different loads and a strong correlation with experimental results is observed. The crack propagation is simulated using XFEM, which successfully simulates the non-propagating crack length.