scholarly journals Elastic-Plastic and Residual Stresses in Clamped Thermoplastic Composite Laminates Loaded Transversely

2011 ◽  
Vol 16 (4) ◽  
pp. 849-857
Author(s):  
Semih Benli ◽  
Mustafa Karamolla ◽  
Fuat Okumus ◽  
Onur Sayman
Keyword(s):  
Residual Stresses ◽  
Composite Laminates ◽  
Thermoplastic Composite ◽  
Elastic Plastic

3D elastic-plastic analysis and experiment of free-edge effects in angle-ply thermoplastic composite laminates

2002 ◽  
Author(s):  
Min Shen ◽  
Jingwei Tong ◽  
Shibin Wang ◽  
Hong-Qi Li ◽  
Pierluigi Priolo ◽  
...  
Keyword(s):  
Edge Effects ◽  
Composite Laminates ◽  
Free Edge ◽  
Thermoplastic Composite ◽  
Elastic Plastic ◽  
Plastic Analysis

scholarly journals Elastic-Plastic Thermal Stresses in a Composite Disc with Multiple Holes

2007 ◽  
Vol 16 (3) ◽  
pp. 096369350701600 ◽  
Author(s):  
Faruk Sen
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Thermal Stresses ◽  
General Purpose ◽  
Thermoplastic Composite ◽  
Uniform Temperature ◽  
Elastic Plastic ◽  
Finite Element Software ◽  
Stress Components ◽  
Multiple Holes

The goal of this study was to investigate elastic-plastic thermal stresses in a thermoplastic composite hollow disc with multiple holes. Different uniform temperature distributions were subjected to the disc as thermal loadings. The thermoplastic composite disc was reinforced by steel fibres as unidirectional for radial direction. Finite element method (FEM) was used to calculate both thermal and residual stresses. Therefore, the thermal stress analysis was carried out using ANSYS finite element software which is known a general purpose engineering simulation. Due to the composite disc having different thermal expansions in radial and tangential directions, thermal stresses were created in it by the applied thermal loadings. The magnitude of the tangential stress components both elastic and elastic-plastic solutions was higher than the radial stress components except edges of multiple holes. In addition, the residual stress components were computed using elastic and elastic-plastic solution results. The calculated results pointed out that the magnitude of thermal and residual stresses were considerably affected increasing of uniform temperature loadings.

Elastic-Plastic Thermal and Residual Stress Analysis of Adhesively Bonded Single Lap Joint

2016 ◽  
Vol 25 (1) ◽  
pp. 096369351602500 ◽  
Author(s):  
Faruk Sen
Keyword(s):  
Residual Stress ◽  
Residual Stresses ◽  
Thermoplastic Composite ◽  
Lap Joint ◽  
Uniform Temperature ◽  
Adhesively Bonded ◽  
Elastic Plastic ◽  
Single Lap Joint ◽  
Plastic Analysis ◽  
Residual Stress Analysis

In this work, an elastic-plastic thermal and residual stress analysis were performed for adhesively bonded single lap joint. For this purpose, thermoplastic composite adherents were bonded to each other with epoxy adhesive. Thermoplastic composite material was reinforced by steel-fibres, unidirectionally. Finite element method (FEM) was preferred to obtain thermal elastic and elastic-plastic stress distributions on single lap joint. Accordingly, modelling and solution processes were achieved using ANSYS software. So as to determine effects of uniform temperature loadings on thermal and residual stresses, different values of it were loaded on the joint, uniformly. Briefly, both thermal and residual thermal stresses were calculated under uniform temperature loading which was selected from 40 °C to 80 °C. According to obtained results different thermal expansion coefficients of composite adherents and adhesive layer caused thermal and residual stresses on adhesively bonded single lap joint due to applied uniform temperature loadings. Thermal stress values for x and y-directions are very different from each other owing to orthotropic material properties of thermoplastic composite. The magnitudes of elastic analyses results are higher than elastic-plastic analysis results. Contrary to elastic analysis results, elastic-plastic analysis results were nonlinear. Thermal and residual stresses are increased by increasing uniform temperature values, so the highest values were calculated when 80 °C. The plastic yielding was firstly come into being for 50 °C loading and it is expanded related to raising thermal loadings as nonlinear.

Localization simulation of forming-induced residual stresses of composite using prescribed boundary

2021 ◽  
pp. 073168442094118
Author(s):  
Qi Wu ◽  
Hongzhou Zhai ◽  
Nobuhiro Yoshikawa ◽  
Tomotaka Ogasawara ◽  
Naoki Morita
Keyword(s):  
Residual Stresses ◽  
Representative Volume Element ◽  
Computational Cost ◽  
Volume Element ◽  
Thermoplastic Composite ◽  
Structural Deformation ◽  
Element Analysis ◽  
Micro Scale ◽  
Representative Volume ◽  
Localization Approach

A novel localization approach that seamlessly bridges the macro- and micro-scale models is proposed and used to model the forming-induced residual stresses within a representative volume element of a fiber reinforced composite. The approach uses a prescribed boundary that is theoretically deduced by integrating the asymptotic expansion of a composite and the equal strain transfer, thus rendering the simulation setting to be easier than conventional approaches. When the localization approach is used for the finite element analysis, the temperature and residual stresses within an ideal cubic representative volume element are precisely simulated, given a sandwiched thermoplastic composite is formed under one-side cooling condition. The simulation results, after being validated, show that the temperature gradient has an impact on the local residual stresses, especially on the in-plane normal stress transverse to the fiber, and consequently, influences the structural deformation. This newly designed localization approach demonstrates the advantages of enhanced precision and reduced computational cost owing to the fast modeling of the finely meshed representative volume element. This is beneficial for a detailed understanding of the actual residual stresses at the micro-scale.

scholarly journals An Improved Analytical Solution for Process-Induced Residual Stresses and Deformations in Flat Composite Laminates Considering Thermo-Viscoelastic Effects

Materials ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 2506 ◽  
Author(s):  
Chao Liu ◽  
Yaoyao Shi
Keyword(s):  
Differential Equation ◽  
Finite Element ◽  
Analytical Solution ◽  
Residual Stresses ◽  
Composite Laminates ◽  
Composite Structures ◽  
Numerical Models ◽  
Element Analysis ◽  
Current Time ◽  
Viscoelastic Effects

Dimensional control can be a major concern in the processing of composite structures. Compared to numerical models based on finite element methods, the analytical method can provide a faster prediction of process-induced residual stresses and deformations with a certain level of accuracy. It can explain the underlying mechanisms. In this paper, an improved analytical solution is proposed to consider thermo-viscoelastic effects on residual stresses and deformations of flat composite laminates during curing. First, an incremental differential equation is derived to describe the viscoelastic behavior of composite materials during curing. Afterward, the analytical solution is developed to solve the differential equation by assuming the solution at the current time, which is a linear combination of the corresponding Laplace equation solutions of all time. Moreover, the analytical solution is extended to investigate cure behavior of multilayer composite laminates during manufacturing. Good agreement between the analytical solution results and the experimental and finite element analysis (FEA) results validates the accuracy and effectiveness of the proposed method. Furthermore, the mechanism generating residual stresses and deformations for unsymmetrical composite laminates is investigated based on the proposed analytical solution.

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