Chandrakant Pol | Shivaji University, Kolhapur, India (original) (raw)

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Papers by Chandrakant Pol

Breast Diseases: A Year Book Quarterly, 2012

Wave Motion, 2013

h i g h l i g h t s • An analytical model is developed for guided wave (GW) propagation in compos... more h i g h l i g h t s • An analytical model is developed for guided wave (GW) propagation in composite plates. • Dispersion behavior of the individual GW modes on the response signal is studied. • Finite element modeling in LS-DYNA validates the theoretical model. • Broadband excitation causes significant shape distortion of the source pulse. • The model allows to separate individual modes even for broadband excitations.

International Journal of Solids and Structures, 2012

A fast and efficient two-dimensional (2D) semi-analytical model based on global matrix method is ... more A fast and efficient two-dimensional (2D) semi-analytical model based on global matrix method is developed to study the general characteristics of guided wave propagation in a honeycomb composite sandwich structure (HCSS) subjected to time-dependent transient surface excitations. The HCSS used in this study has an extremely lightweight and thick nomex honeycomb core, which is sandwiched between two thin graphite woven composite skins. The homogenized material properties of the skin and the core are considered to be elastic and quasi-isotropic in nature. Far-field time history of surface displacements are calculated for vertical and horizontal tone-burst surface excitations that are representative of thickness and radial mode of vibrations of piezoelectric transducers, respectively. Results are compared with those obtained from Finite element modeling (FEM) in LS-DYNA showing good agreement. Wavelet transform is then performed on the time-domain signal to obtain the group velocities of the propagating modes for their accurate identification on the basis of the theoretical dispersion curve. It is found that the response signal is dominated by the first anti-symmetric mode for a vertical excitation, whereas, the signal characteristics are multimodal in nature with dominating higher order symmetric and anti-symmetric modes for a horizontal excitation. The model is expected to be helpful for appropriate guided wave mode tuning and rapid analysis of data for experimental detection of disbonds in these novel structures.

Journal of emerging technologies and innovative research, 2020

Composite Bridges combines the advantages of both Concrete Bridges and Steel Bridges. Composite b... more Composite Bridges combines the advantages of both Concrete Bridges and Steel Bridges. Composite bridges are most suitable for construction of Medium Span Bridges. Major types of Highway Bridges are Medium Span Bridges. Structural assessment of these bridges can be done using SHM sensors. Structural Health Monitoring (SHM) is a new emerging technique used for structural condition assessment of various structures using attached or embedded sensors. In this paper, a Composite Bridge Model is constructed and the Structural Health Monitoring of this bridge model is done using the wired sensors. The response of these sensors is compared and validated using Simulation Model Analysis Results of same bridge prepared on Finite Element Method based software MIDAS Civil.

Journal of emerging technologies and innovative research, 2018

RCC skew bridges are more often encountered in the highways. Recent growth of transportation infr... more RCC skew bridges are more often encountered in the highways. Recent growth of transportation infrastructure has increased the number of skew bridges in India. In this paper the RCC skew bridge with skew angle 60 0 is taken into consideration and its analysis is done using the finite analysis software. The bridge is subjected to dead loads, IRC standard moving loads and also response spectrum analysis is done to take into account the earthquake effects. The behavior skew bridge is observed in terms of bending moments, shear force and torsional moments and then the design of pier is done. The RCC bridges undergo the deterioration over the period of time and there after it may not be able to withstand the given stress. Deterioration causes loss of strength and alternatively in moment of inertia of RCC members. This effect can be taken into account by effective moment of inertia concept specified in various codes. It is necessary to retrofit the piers. The paper implements Indian code I...

Large span roof shell structures have an inherent tendency to be unstable under dynamic loads. Ho... more Large span roof shell structures have an inherent tendency to be unstable under dynamic loads. However the dynamic behavior of these is not well documented. An in depth analysis is required to understand its bending, vibration, axial, buckling etc. However, the present investigation focused on free vibration behavior. In this research study, models of spherical single layer reticulated roof shell structures were established in Finite Element software CSi SAP2000. Based on free vibration frequency the dynamic behavior of these structures was investigated in this research paper. Parametric analysis was conducted and the influence of these parameters on the structure was observed in terms of free vibration frequency. Several parameters were considered for the analysis such as, different span diameters, different roof loading and rise to span ratios. Based on the analysis, the optimum rise to span ratio was found out.

A promising new in-situ Health monitoring technique is proposed for Honeycomb Composite Sandwich ... more A promising new in-situ Health monitoring technique is proposed for Honeycomb Composite Sandwich Structures (HCSS). The semi-analytical method based upon Global Matrix approach is used to study the dispersion characteristics of the Honeycomb Composite Sandwich Structure (HCSS) with disbonds. The specimen HCSS plate is modeled w/o disbonds and analyzed for vertical GW PZT excitations using this technique and compared these results with a compatible HCSS model developed using Finite Element based software LS-DYNA. The results are found in excellent agreement for the developed HCSS models .

This study explores the result of an experimental investigation for enhancing shear strength of m... more This study explores the result of an experimental investigation for enhancing shear strength of masonry wall, strengthened with Carbon Fiber Reinforced Polymer (CFRP) strips. Total 18 numbers of specimens were casted. Out of this 9 specimens were tested for standard condition and 9 were for deteriorated condition in that three were tested with CFRP wrapping respectively. The dimensions of all masonry wall panels are kept same throughout the experiment. Experiments are conducted to study the shear strength of masonry walls with and without FRP using local available materials. For the experiment shear compression test was conducted. Deterioration of the specimens is done by using solutions of calcium chloride (CaCl2) with 3 molal ion concentrations. The experimental results demonstrated that the use of CFRP composite strips increases the shear strength of the masonry wall significantly by preventing the debonding of CFRP sheets, so that the full strength of the CFRP sheets get utilized.

Deterioration in reinforced concrete structures is a major issue faced by the infrastructures ind... more Deterioration in reinforced concrete structures is a major issue faced by the infrastructures industries all over the world. Since complete replacement of these structures requires high investment, strengthening has become the suitable solution to modify and improve the performance of the structures. The strengthening of RC beams using FRP composites has become a popular structural strengthening technique, due to the well-known advantages of FRP composites such as their high strength-to-weight ratio and excellent corrosion resistance. This study explores the result of an experimental investigation for enhancing the flexure capacity of reinforced concrete (RC) beams with flexure deficiencies, strengthened with Carbon Fiber Reinforced Polymer (CFRP) sheets. Total 18 numbers of specimens were casted. Out of this 9 specimens were tested for control beam and 9 were for deterioration in that three were tested with CFRP wrapping respectively. The geometry of all beams are 1200mm overall le...

Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2014

Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2014, Mar 9, 2014