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You searched for +publisher:"Rutgers University" +contributor:("Weng, George J. "). Showing records 1 – 2 of 2 total matches.

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1. Banerjee, Sankha, 1985-. An experimental and theoretical analysis of two and three phase epoxy based piezoelectric composites.

Degree: MS, Mechanical and Aerospace Engineering, 2013, Rutgers University

New composite materials and devices are been investigated by researchers in the fields of energy harvesting, structural health monitoring (SHM) of civil and mechanical structures and acoustic attenuation. The criteria that govern the applicability of these types of devices are their sensitivity and durability, which depend on electromechanical properties such as the dielectric constant, piezoelectric strain coefficient, and the dielectric loss. The present work investigates the role of Aluminum and PZT inclusions distributed in an epoxy matrix to fabricate composites with high dielectric and strain coefficients. The influence of Aluminum inclusion size (nano and micron) and (lead zirconate titanate) PZT and Aluminum volume fraction on the electromechanical properties of the three phase PZT-epoxy-aluminum composites were experimentally investigated. An analytical expression for the prediction of the effective dielectric constant of a three phase 0-3-0 piezoelectric composite has also been developed. The analytical results are verified with the experimental results from Nan et al. The analytical model is also extended to include the shape of a conductive inclusion phase; to examine the influence of the shape on the effective dielectric constant of the composite. The electromechanical properties of the composites are influenced by several factors: inclusion agglomeration, contact resistance between particles, and air voids. The present work studies the influence of these factors on the effective electromechanical properties of the composite. Advisors/Committee Members: Banerjee, Sankha, 1985- (author), Cook-Chennault, Kimberly A. (chair), Weng, George J. (internal member), Pelegri, Assimina A. (internal member).

Subjects/Keywords: Piezoelectric materials; Epoxy compounds

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APA (6th Edition):

Banerjee, Sankha, 1. (2013). An experimental and theoretical analysis of two and three phase epoxy based piezoelectric composites. (Masters Thesis). Rutgers University. Retrieved from http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000068814

Chicago Manual of Style (16th Edition):

Banerjee, Sankha, 1985-. “An experimental and theoretical analysis of two and three phase epoxy based piezoelectric composites.” 2013. Masters Thesis, Rutgers University. Accessed March 24, 2019. http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000068814.

MLA Handbook (7th Edition):

Banerjee, Sankha, 1985-. “An experimental and theoretical analysis of two and three phase epoxy based piezoelectric composites.” 2013. Web. 24 Mar 2019.

Vancouver:

Banerjee, Sankha 1. An experimental and theoretical analysis of two and three phase epoxy based piezoelectric composites. [Internet] [Masters thesis]. Rutgers University; 2013. [cited 2019 Mar 24]. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000068814.

Council of Science Editors:

Banerjee, Sankha 1. An experimental and theoretical analysis of two and three phase epoxy based piezoelectric composites. [Masters Thesis]. Rutgers University; 2013. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000068814

2. Pan, Yi, 1974-. Stiffness and progressive damage analysis on random chopped fiber composite using FEM.

Degree: PhD, Mechanical and Aerospace Engineering, 2010, Rutgers University

The need of vehicle weight reduction and fuel efficiency in the automotive industry calls for substituting traditional materials with lightweight ones. With the maturity of the preforming technologies, random chopped fiber composites have received increasing attention in recent years as replacement for traditional structural materials. In order to expand their application, accurate material characterization is required. Material properties such as effective elastic stiffness, material damage behavior, and strength are of primary interest. In this thesis, a micro-mechanics based finite element analysis method for the random chopped fiber composite is developed. In order to obtain the effective material properties of random chopped fiber composites, a modified random sequential adsorption technique is proposed to generate the representative volume element of random chopped fiber composites. In the three-dimensional representative volume element generation algorithm, a fiber is bended locally to avoid intersecting other fibers and consequently to overcome the "jamming limit" in the existing techniques. The volume fraction of a representative volume element generated by the modified random sequential adsorption is as high as that of the specimens provided by industry, which is about 35% to 40%. A homogenization scheme is applied to the finite element solution of the boundary value problem, defined in the representative volume element with proper boundary conditions, to compute the effective elastic stiffness constants of the composite. An automatic procedure based on a moving window technique is also presented to determine the proper size of the representative volume element of the random chopped fiber composite. Investigation on the damage behavior of the composite is carried out by using constituent's mechanical properties. Three damage mechanisms are considered, namely, the matrix cracking, interfacial debonding, and fiber breakage. The cohesive zone model is adopted to represent interfacial debonding. The effect of matrix cracking is accounted for by a modified von Mises yield criterion and subsequently a gradual material degradation model. Fiber breakage is modeled by a stress-based failure criterion and a sudden material degradation model. Effects of interfacial strength, critical energy release rate, and residual thermal stress on the overall performance of the composite are investigated. The results of the finite element analysis are validated by experimental data.

Advisors/Committee Members: Pan, Yi, 1974- (author), Pelegri, Assimina A. (chair), Dill, Ellis H. (internal member), Weng, George J. (internal member), Shreiber, David I. (outside member).

Subjects/Keywords: Elastic analysis (Engineering); Composite materials in automobiles

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Pan, Yi, 1. (2010). Stiffness and progressive damage analysis on random chopped fiber composite using FEM. (Doctoral Dissertation). Rutgers University. Retrieved from http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056698

Chicago Manual of Style (16th Edition):

Pan, Yi, 1974-. “Stiffness and progressive damage analysis on random chopped fiber composite using FEM.” 2010. Doctoral Dissertation, Rutgers University. Accessed March 24, 2019. http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056698.

MLA Handbook (7th Edition):

Pan, Yi, 1974-. “Stiffness and progressive damage analysis on random chopped fiber composite using FEM.” 2010. Web. 24 Mar 2019.

Vancouver:

Pan, Yi 1. Stiffness and progressive damage analysis on random chopped fiber composite using FEM. [Internet] [Doctoral dissertation]. Rutgers University; 2010. [cited 2019 Mar 24]. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056698.

Council of Science Editors:

Pan, Yi 1. Stiffness and progressive damage analysis on random chopped fiber composite using FEM. [Doctoral Dissertation]. Rutgers University; 2010. Available from: http://hdl.rutgers.edu/1782.1/rucore10001600001.ETD.000056698

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