Geometric Non Linear Analysis of Composite Shells Under Thermomechanical Loading

2005 ◽  
Author(s):  
B. Sutharson ◽  
R. Sarala ◽  
R. Kari Thangarathanam
Keyword(s):  
Thermal Stress ◽  
Boundary Conditions ◽  
Stress Analysis ◽  
Shell Element ◽  
Linear Analysis ◽  
Thermomechanical Loading ◽  
Composite Shells ◽  
Thermal Stress Analysis ◽  
Linear Buckling ◽  
Non Linear

A Geometric non-linear analysis of composite shells under thermomechanical loading has been discussed here. From the literature, it may be seen that the thermal stress analysis of structural elements has continued to remain a research topic for a couple of decades. No one computationally verified the geometric non-linear buckling of composite shells under thermomechanical loading using semiloof element. In this work, linear buckling analysis of Kari Thangaratnam (2) is extended to geometric non-linear analysis of composite shells under thermomechanical loading. A general shell element called the semiloof shell element has been extended to thermal stress analysis of laminated shells. The formulation is based on nonlinear theory and the finite element method using semiloof element. The validation checks on the program are carried out using results on homogeneous isotropic shells available in the literature. The parameters considered in analysis are (1) number of layers in the laminate, (2) Lay-up sequence (symmetry, antisymmetry, cross-ply etc.), (3) Fibre orientation angle, (4) Different aspect ratios, (5) Orthotrophy ratio, (6) Boundary conditions (simply supported, clamped and combination of boundary conditions).

Geometric Non Linear Analysis of Composite Shells Under Thermomechanical Load

2004 ◽  
Author(s):  
B. Sutharson ◽  
A. Elaya Perumal ◽  
R. Kari Thangarathanam
Keyword(s):  
Thermal Stress ◽  
Boundary Conditions ◽  
Stress Analysis ◽  
Shell Element ◽  
Linear Analysis ◽  
Composite Shells ◽  
Thermal Stress Analysis ◽  
Aspect Ratios ◽  
Linear Buckling ◽  
Non Linear

Geometric nonlinear analysis of composite shells under thermomechanical load is reported here. From the literature, it may be seen that the thermal stress analysis of structural elements has continued to remain a research topic for a couple of decades. No one computationally verified the geometric non-linear buckling of composite shells under thermomechanical load using semiloof element. In this work, linear buckling analysis of Kari Thangaratnam (2) is extended to geometric non-linear analysis of composite shells under thermomechanical load. A general shell element called the semiloof shell element has been extended to thermal stress analysis of laminated shells. The formulation is based on nonlinear theory and the finite element method using semiloof element. The validation checks on the program are carried out using results on homogeneous isotropic shells available in the literature. The parameters considered in analysis are (1) number of layers in the laminate, (2) Lay-up sequence (symmetry, antisymmetry, cross-ply etc.), (3) Fibre orientation angle, (4) Different aspect ratios, (5) Orthotrophy ratio, (6) Boundary conditions (simply supported, clamped and combination of boundary conditions).

scholarly journals Heat conduction and Thermal Stress Analysis of laminated composites by a variable kinematic MITC9 shell element

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
M. Cinefra ◽  
S. Valvano ◽  
E. Carrera
Keyword(s):  
Heat Conduction ◽  
Thermal Stress ◽  
Stress Analysis ◽  
Composite Structures ◽  
Single Layer ◽  
Shell Element ◽  
Virtual Displacement ◽  
Thermal Stress Analysis ◽  
Shell Finite Element ◽  
Benchmark Solutions

AbstractThe present paper considers the linear static thermal stress analysis of composite structures by means of a shell finite element with variable through-thethickness kinematic. The temperature profile along the thickness direction is calculated by solving the Fourier heat conduction equation. The refined models considered are both Equivalent Single Layer (ESL) and Layer Wise (LW) and are grouped in the Unified Formulation by Carrera (CUF). These permit the distribution of displacements, stresses along the thickness of the multilayered shell to be accurately described. The shell element has nine nodes, and the Mixed Interpolation of Tensorial Components (MITC) method is used to contrast the membrane and shear locking phenomenon. The governing equations are derived from the Principle of Virtual Displacement (PVD). Cross-ply plate, cylindrical and spherical shells with simply-supported edges and subjected to bi-sinusoidal thermal load are analyzed.Various thickness ratios and curvature ratios are considered. The results, obtained with different theories contained in the CUF, are compared with both the elasticity solutions given in the literature and the analytical solutions obtained using the CUF and the Navier’s method. Finally, plates and shells with different lamination and boundary conditions are analyzed using high-order theories in order to provide FEM benchmark solutions.

Micro-Via Reliability Study of High-Density Substrate

2005 ◽  
Author(s):  
Youhong Wu
Keyword(s):  
Thermal Stress ◽  
Stress Analysis ◽  
Manufacturing Process ◽  
High Density ◽  
Reliability Test ◽  
Reliability Study ◽  
Effective Factors ◽  
Thermal Stress Analysis ◽  
Non Linear ◽  
Market Needs

The micro-via dimension of substrate decreased rapidly as the I/O density of substrate dramatically increased to meet the high market needs. However, the strength of micro-via becomes weak, and will be easily broken during the manufacturing process or reliability test. The purpose of this study is to understand the key effective factors of the micro-via reliability with the 3D non-linear thermal stress analysis using the Multi-scaling modeling (submodeling) technique.

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