Elasto-Plastic Behavior of Thermoplastic Matrix Roller Chain Link Plates Reinforced With Steel Fibers

2000 ◽  
Author(s):  
Nurettin Arslan ◽  
Erol Sancaktar ◽  
Mehmet Celik
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Computer Program ◽  
Stress Analysis ◽  
Steel Fibers ◽  
Finite Elements Analysis ◽  
Roller Chain ◽  
Thermoplastic Matrix ◽  
Chain Link ◽  
Plastic Stress

Abstract The elastic and elasto-plastic stress analysis of thermoplastic matrix roller chain link plates reinforced with steel fibers is performed by using Finite Elements Analysis (FEA). A two-dimensional finite element computer program is developed for elasto-plastic stress analysis. Isoparametric quadratic element with four nodes is used with Lagrange polynomial as an interpolation function. The results of elastic and elasto-plastic finite element stress analysis by using the computer program prepared, are compared with experimental, (photoelastic) results. The spreads of the plastic zones due to the external load applied on the pin-hole of the plate and variations of the residual stresses are determined in different orientation angles and loads. It is shown that the geometry of the link plates can be designed to decrease the stress concentrations. Furthermore, it is shown that the tensile load limit of the roller chain link plate is extended by the residual stresses.

Elasto-Plastic Finite Element Stress Analysis of Thermoplastic-Matrix Symmetric Cross-Ply Plates With Square Hole

2000 ◽  
Author(s):  
Nurettin Arslan ◽  
Aydın Turgut ◽  
Erol Sancaktar
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
Orientation Angle ◽  
Shear Deformation Theory ◽  
Composite Plates ◽  
Laminated Plates ◽  
Thermoplastic Matrix ◽  
Lagrangian Finite Element ◽  
Square Hole ◽  
Plastic Stress

Abstract In this study, elasto-plastic stress analysis of symmetric cross-ply reinforced thermoplastic (PVC) matrix composite laminated plates with square hole is presented. A two-dimensional computer program is developed for elasto-plastic stress analysis of laminated plates by FEM. The thermoplastic matrix is reinforced using long stainless steel fibers. The composite plates are manufactured by using molds under the action of 2 MPa pressure, and heating up to 200 °C. The laminated plate with square hole consists of four reinforced layers bonded symmetrically in ([θ/-θ]2) cross-ply configuration. A first–order shear deformation theory, and nine node Lagrangian finite element method are used in analysis. The applied in-plane load, and the layer orientation angle are varied to obtain the corresponding variation of residual stresses, and the expansions of plastic regions for various cases.

An Analytical Approach to Elastic-Plastic Stress Analysis of Rolling Contact

1994 ◽  
Vol 116 (3) ◽  
pp. 577-587 ◽  
Author(s):  
Yanyao Jiang ◽  
Huseyin Sehitoglu
Keyword(s):  
Residual Stresses ◽  
Stress Analysis ◽  
Analytical Approach ◽  
Kinematic Hardening ◽  
Tangential Force ◽  
Rolling Contact ◽  
Approximate Determination ◽  
Elastic Plastic ◽  
Surface Plasticity ◽  
Plastic Stress

Based on a stress invariant hypothesis and a stress/strain relaxation procedure, an analytical approach is forwarded for approximate determination of residual stresses and strain accumulation in elastic-plastic stress analysis of rolling contact. For line rolling contact problems, the proposed method produces residual stress distributions in favorable agreement with the existing finite element findings. It constitutes a significant improvement over the Merwin-Johnson and the McDowell-Moyar methods established earlier. The proposed approach is employed to study combined rolling and sliding for selected materials, with special attention devoted to 1070 steel behavior. Normal load determines the subsurface residual stresses and the size of the subsurface plastic zone. On the other hand, the influence of tangential force penetrates to a depth of 0.3a, where a is the half width of the contact area, and has diminishing influence on the residual stresses beyond this thin layer. A two-surface plasticity model, commensurate with nonlinear kinematic hardening, is utilized in solution of incremental surface displacements with repeated rolling. It is demonstrated that a driven wheel undergoes greater plastic deformation than the driving wheel, suggesting that the driven wheel experiences enhanced fatigue damage. Furthermore, the calculated residual stresses are compared with the existing experimental data from the literature with exceptional agreements.

scholarly journals Elastic-Plastic Stress Analysis of Thermoplastic Matrix Laminated Composite Beams

2004 ◽  
Vol 9 (1) ◽  
pp. 49-64
Author(s):  
Hasan Çallioğlu ◽  
N. Sman Köksal ◽  
Necati Ataberk ◽  
İdris Kaynak
Keyword(s):  
Stress Analysis ◽  
Laminated Composite ◽  
Composite Beams ◽  
Elastic Plastic ◽  
Thermoplastic Matrix ◽  
Laminated Composite Beams ◽  
Plastic Stress
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