scholarly journals Effects of Moisture on Stress-Strain Response and Damage Evolution in Quasi-Isotropic Laminates.

1998 ◽  
Vol 24 (1) ◽  
pp. 20-29 ◽  
Author(s):  
Keiji OGI ◽  
Yoshihiro TAKAO
Keyword(s):  
Damage Evolution ◽  
Strain Response ◽  
Stress Strain

Modeling Damage Evolution in a Hybrid Ceramic Matrix Composite Under Static Tensile Load

1997 ◽  
Vol 119 (4) ◽  
pp. 401-407 ◽  
Author(s):  
N. Bonora ◽  
G. Newaz
Keyword(s):  
Tensile Stress ◽  
Damage Evolution ◽  
Failure Modes ◽  
Strain Response ◽  
Load Drop ◽  
Stress Strain ◽  
Matrix Cracks ◽  
The Matrix ◽  
Constitutive Response ◽  
Hybrid Ceramic

In this investigation, damage evolution in a unidirectional hybrid ceramic composite made from Nicalon and SiC fibers in a Lithium Aluminosilicate (LAS) glass matrix was studied. The static stress-strain response of the composite exhibited a linear response followed by load drop in a progressive manner. Careful experiments were conducted stopping the tests at various strain levels and using replication technique, scanning and optical microscopy to monitor the evolution of damage in these composites. It was observed that the constituents of the composite failed in a sequential manner at increasing strain levels. The matrix cracks were followed by SiC fiber failures near ultimate tensile stress. After that, the load drop was associated with progressive failure of the Nicalon fibers. Identification of these failure modes were critical to the development of a concentric cylinder model representing all three constituent phases to predict the constitutive response of the CMC computationally. The strain-to-failure of the matrix and fibers were used to progressively fail the constituents in the model and the overall experimental constitutive response of the CMC was recovered. A strain based analytical representation was developed relating stiffness loss to applied strain. Based on this formulation, damage evolution and its consequence on tensile stress-strain response was predicted for room temperature behavior of hybrid CMCs. The contribution of the current work is that the proposed strain-damage phenomenological model can capture the damage evolution and the corresponding material response for continuous fiber-reinforced CMCs. The modeling approach shows much promise for the complex damage processes observed in hybrid CMCs.

Experimental Characterization of Mechanical Behavior of Cord-Rubber Composites

1982 ◽  
Vol 10 (1) ◽  
pp. 37-54 ◽  
Author(s):  
M. Kumar ◽  
C. W. Bert
Keyword(s):  
Response Characteristic ◽  
Cord Compression ◽  
Complete Characterization ◽  
Strain Response ◽  
Strain Gages ◽  
Experimental Characterization ◽  
Rubber Composites ◽  
Stress Strain ◽  
Strain Data

Abstract Unidirectional cord-rubber specimens in the form of tensile coupons and sandwich beams were used. Using specimens with the cords oriented at 0°, 45°, and 90° to the loading direction and appropriate data reduction, we were able to obtain complete characterization for the in-plane stress-strain response of single-ply, unidirectional cord-rubber composites. All strains were measured by means of liquid mercury strain gages, for which the nonlinear strain response characteristic was obtained by calibration. Stress-strain data were obtained for the cases of both cord tension and cord compression. Materials investigated were aramid-rubber, polyester-rubber, and steel-rubber.

Cyclic stress-strain response of porous aluminum

1990 ◽  
Vol 6 (2) ◽  
pp. 207-230 ◽  
Author(s):  
Han C. Wu ◽  
Paul T. Wang ◽  
W.F. Pan ◽  
Z.Y. Xu
Keyword(s):  
Cyclic Stress ◽  
Strain Response ◽  
Stress Strain ◽  
Porous Aluminum

Impact of random soil properties on stress–strain response

2004 ◽  
Vol 41 (2) ◽  
pp. 351-355 ◽  
Author(s):  
Dieter Stolle ◽  
Peijun Guo ◽  
Gabriel Sedran
Keyword(s):  
Soil Properties ◽  
Constitutive Modelling ◽  
Soil Parameters ◽  
Strain Response ◽  
Constitutive Behaviour ◽  
Stress Strain ◽  
Deterministic Analysis ◽  
Model Predictions ◽  
Random Variability ◽  
The Impact

This paper analyzes the impact of natural random variation of soil properties on the constitutive modelling of geomaterial behaviour. A theoretical framework for accommodating variation in soil properties is presented. The framework is then used to examine the consequence of parameter variability on stress–strain relations. An important observation is that average soil parameters from a series of tests on small specimens, in which density of the specimens varies randomly, do not necessarily reflect the average constitutive behaviour of soil. Model predictions are shown to be consistent with the experimental data.Key words: random variability, deterministic analysis, soil parameters, constitutive model.

The thermomechanical stress-strain response of intumescent mat materials through experiments and strain decomposition

2002 ◽  
Vol 37 (3) ◽  
pp. 187-199 ◽  
Author(s):  
H. J Kim ◽  
J. S Kim ◽  
M. E Walter ◽  
J. K Lee
Keyword(s):  
Constitutive Modelling ◽  
Load Control ◽  
Strain Response ◽  
Stress Strain ◽  
Dead Weight ◽  
Transient Stress ◽  
Thermomechanical Stress ◽  
Decomposition Procedure ◽  
Property Changes ◽  
Strain Responses

Intumescent mat materials in catalytic converters undergo chemical reactions that lead to material property changes and volume expansion during heating processes. Dead weight (load control) and displacement control compression experiments have been performed to explore static and transient stress-strain responses. The apparatus and methods for both experiments are described. The experimental results together with a strain decomposition procedure yield a master curve that can be employed for constitutive modelling.

scholarly journals Finite Element Analysis of Stress-Strain Response at the Tool Pin During Friction Stir Process

2015 ◽  
Vol 76 ◽  
pp. 522-527
Author(s):  
M. Shamil Jaffarullah ◽  
Nur’Amirah Busu ◽  
Cheng Yee Low ◽  
J.B. Saedon ◽  
Armansyah ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Strain Response ◽  
Stress Strain ◽  
Element Analysis ◽  
Friction Stir Process ◽  
Friction Stir ◽  
Tool Pin
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