Deformation and Fracture Characteristics of a Gamma Titanium Alumtnide at High Temperatures

1992 ◽  
Vol 288 ◽  
Author(s):  
V. Seetharaman ◽  
S. L. Semiatin ◽  
C. M. Lombard ◽  
N. D. Frey
Keyword(s):  
High Temperatures ◽  
Fracture Characteristics ◽  
Gamma Titanium ◽  
Deformation And Fracture

Deformation and Fracture Characteristics of Cenosphere Filled Epoxies Under Compressive Loading Conditions

2001 ◽  
Author(s):  
Nikhil Gupta ◽  
Eyassu Woldesenbet
Keyword(s):  
Epoxy Resins ◽  
Fracture Behavior ◽  
Moisture Absorption ◽  
Compressive Loading ◽  
Polymeric Materials ◽  
Local Stress ◽  
Fracture Characteristics ◽  
Structured Materials ◽  
Deformation And Fracture

Abstract Close cell structured foams are made by incorporation of cenospheres in polymeric materials. Low moisture absorption characteristics and considerably higher compressive strength of these materials compared to open cell structured foams make them suitable for use as core materials in sandwich structured materials. Incorporation of cenospheres in the epoxy resins enhances their impact strength and damage tolerance, especially if these materials are used in sandwich configurations. Present study analyzes and compares the effect of incorporation of cenospheres like flyash and glass microballoons in the epoxy resins on the deformation and fracture behavior of the material. Approach based on determination of local stress intensity factors is used to obtain estimate of the stresses in the material.

Structure-dependent grain boundary deformation and fracture at high temperatures

2005 ◽  
Vol 410-411 ◽  
pp. 140-147 ◽  
Author(s):  
Tadao Watanabe ◽  
Sadahiro Tsurekawa ◽  
Shigeaki Kobayashi ◽  
Shin-ichi Yamaura
Keyword(s):  
Grain Boundary ◽  
High Temperatures ◽  
Deformation And Fracture ◽  
Boundary Deformation

Deformation and Fracture of Bone Analogue Biomaterials Having Different Polymer Matrices

2008 ◽  
Vol 47-50 ◽  
pp. 1391-1394
Author(s):  
Min Wang ◽  
Ya Liu ◽  
Chun Ling Au ◽  
Pik Ki Lai ◽  
Lai Yee Leung ◽  
...  
Keyword(s):  
Polymer Composites ◽  
Tissue Repair ◽  
Mechanical Performance ◽  
Mechanical Tests ◽  
Hard Tissue ◽  
Fracture Characteristics ◽  
The Past ◽  
Reinforced Polymer ◽  
Deformation And Fracture ◽  
Biological Assessments

By mimicking the microstructure of human cortical bone, a variety of bioactive particle reinforced polymer composites have been developed for hard tissue repair. Apart from biological assessments, these composites must be fully evaluated in terms of their mechanical performance before they can be used in patients. The bioactive particles in these composites are normally hard (relative to matrix materials) and brittle bioceramics such as hydroxyapatite (HA), tricalcium phosphate (TCP), Bioglass, etc. The matrices can be either “biostable” polymers such as high density polyethylene (HDPE) and polysulfone (PSU) or biodegradable polymers such as polyhydroxybutyrate (PHB) and poly(L-lactide) (PLLA). These polymers on their own possess different mechanical properties and display different deformation behaviours. With the incorporation of various amounts of particulate HA, TCP or Bioglass, the bone analogue polymeric composites exhibit a spectrum of deformation and fracture characteristics. In our systematic studies of HA/HDPE, Bioglass/HDPE, HA/PSU, HA/PHB, TCP/PHB and a few other bone analogues biomaterials over the past fifteen years, mechanical tests were conducted under a variety of loading conditions (tension, compression, bending, torsion, etc.). Comparisons of deformation and fracture behaviours of these composites were made and presented. The insights that have been gained are important for developing other bioactive ceramic-polymer composites.

Atomistic Study on Nano Stress-Strain Curves of α-Fe

1997 ◽  
Vol 492 ◽  
Author(s):  
Shenyang Hu ◽  
Matthias Ludwig ◽  
Liam Farrissey ◽  
Siegfried Schmauder
Keyword(s):  
Boundary Conditions ◽  
Tensile Deformation ◽  
Tensile Axis ◽  
Plane Boundary ◽  
Uniaxial Tensile ◽  
Stress Strain ◽  
Fracture Characteristics ◽  
Deformation And Fracture ◽  
Dislocation Movement ◽  
Atomistic Study

ABSTRACTThe atomistic processes and stress-strain-curves during uniaxial tensile deformation of a single α-Fe nanocrystal have been studied with the molecular static method. Periodic boundary conditions are imposed along one direction perpendicular to the tensile axis to model plane strain conditions. The effects of the model sizes in plane, boundary conditions and crystal orientations on the stress-strain curves are systematically analyzed. Various deformation evidences such as dislocation movement, dislocation piling up and twinning are clearly observed. The deformation and fracture characteristics of a-Fe and their dependencies on the boundary conditions are investigated.

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