Analysis of Stress Transfer, Deformation and Fracture Strength by FESM, an Analysis Method for Discontinuous Medium.

1996 ◽  
pp. 23-38 ◽  
Author(s):  
Takatsugu Suzuki ◽  
Ryokichi Hamajima
Keyword(s):  
Fracture Strength ◽  
Stress Transfer ◽  
Analysis Method ◽  
Deformation And Fracture ◽  
Discontinuous Medium

scholarly journals Measurement of anisotropy in deformation and fracture strength of aluminum beverage can using biaxial stress tests

2008 ◽  
Vol 58 (9) ◽  
pp. 449-455
Author(s):  
Toshihiko Kuwabara ◽  
Hiroyuki Inoue ◽  
Yasuhiro Hanabusa ◽  
Ryoichi Ito ◽  
Hideo Takizawa
Keyword(s):  
Fracture Strength ◽  
Biaxial Stress ◽  
Stress Tests ◽  
Deformation And Fracture

Elasticity and fracture in particulate composites with strong and degraded interfaces

1996 ◽  
Vol 11 (5) ◽  
pp. 1293-1304 ◽  
Author(s):  
A. Lekatou ◽  
S. E. Faidi ◽  
S. B. Lyon ◽  
R. C. Newman
Keyword(s):  
Elastic Modulus ◽  
Fracture Strength ◽  
Porous Polymer ◽  
Glass Content ◽  
Particulate Composites ◽  
Nominal Strain Rate ◽  
Interface Damage ◽  
Small Peak ◽  
Deformation And Fracture ◽  
Osmotic Water

Silane-coated glass microspheres randomly embedded in an epoxy polymer matrix have been employed as a model system to investigate the degradation of disordered composite materials by water, and to test various models of deformation and fracture. Numerous composites containing sodalime (A) glass in the range 0 to 25% by volume were tested dry and immersed in saturated NaCl at 40 °C for periods up to 70 days before testing. Enhanced osmotic water uptake due to percolating interface damage was observed for composites containing more than 15% glass. The electrical resistance of similar composites filled with conducting spheres confirmed the existence of a percolation transition, though with high resistance values implying no direct contact of the spheres. Tensile measurements conducted on dry material at a nominal strain rate of about 10−3 s−1 showed an increase in elastic modulus and a decrease in the fracture strength with increasing glass content. New detail was apparent in these curves and confirmed by statistical analyses. For wet specimens, in addition to a general embrittlement effect of water absorption, there was a distinct plateau or small peak in fracture strength in the range 9 to 12% glass, and an abrupt drop between 12 and 15%. The plateau can be related to favorable crack interaction effects between disconnected clusters of interfaces just below the percolation threshold. The steep increase in elastic modulus with glass content seen in the dry material vanished entirely in wet material, which behaved like a porous polymer above 6% glass, owing to osmotic interface damage within particle clusters.

Dynamic Assessment of Hip Fracture under Different Impact Configurations: An Explicit Dynamic Analysis Approach

2014 ◽  
Vol 651-653 ◽  
pp. 371-375
Author(s):  
Da Chen ◽  
Xiu Min Chen ◽  
Qin Qun Chen
Keyword(s):  
Femoral Neck ◽  
Yield Point ◽  
Computational Models ◽  
Dynamic Assessment ◽  
Stress Transfer ◽  
Damage Mechanism ◽  
Analysis Method ◽  
In The Beginning ◽  
Explicit Dynamic ◽  
Dynamic Damage

Dropping the hip causes stress transfer in the femur. Understanding stress transfer during dropping of the hip is very essential for the surgery .In this study, two computational models are constructed and used to simulate two hip fall scenes. We employ explicit dynamics analysis method to explore dynamic damage mechanism of hip joint, providing biomechanical basis for surgical intervention. The simulation results show that the stress continues to increase in the beginning and reach a maximum during dropping. In scene one, high stresses were presented on the femoral neck when the trochanter impacted the ground, and they were presented on the femoral trochanter when the ilium impacted the ground. The peak stresses were greater than yield point, the neck and trochanter were broken. In scene two, high stresses were presented on the femoral head when the distal femur impacted hit the ground, and they were presented on the femoral neck and shaft when the ilium rebounded from the ground. The later stresses were greater than yield point, the femoral neck and shaft were broken.

scholarly journals Location-based fatigue damage assessment on an FPSO by the spectral analysis method

2019 ◽  
Vol 272 ◽  
pp. 01019
Author(s):  
A Viswanathan ◽  
V A Subramanian ◽  
D Kumar
Keyword(s):  
Transfer Function ◽  
Fatigue Damage ◽  
Stress Transfer ◽  
Bending Moment ◽  
Spectral Density Function ◽  
Structural Member ◽  
Offshore Platforms ◽  
Loading Conditions ◽  
Analysis Method ◽  
Damage Prediction

Floating production storage and offloading ships (FPSOs) are offshore platforms positioned at a location and operating at different loading conditions and corresponding draughts. Due to their static location, they get subjected to continuous fluctuating loads due to the sea environment. For these reasons the fatigue damage prediction of an FPSO is essential. The emphasis of this study is on the effect of fatigue damage at critical joints of critical structural members under the influence of vertical and horizontal bending in isolation and combination. The method considers an FPSO of 320m length for a case study, selecting a total of fourteen such structural member locations along the periphery at its midship section. The analysis considers two necessary loading conditions namely, fully loaded and ballast condition. The study uses spectral fatigue analysis method wherein the bending moment transfer function generates the stress transfer function, which in turn helps to generate the power spectral density function. Combining the spectral moments with Palmgren-Miner rule gives the cumulative fatigue damage of the FPSO. The results provide an insight into the variation in fatigue damage concerning the location of the structural member under the influence of vertical and horizontal bending moments.

Determination of the fracture strength for ceramic film on substrate by X-ray stress analysis method

2006 ◽  
Vol 56 (3) ◽  
pp. 208-213 ◽  
Author(s):  
M. Qin ◽  
D.Y. Ju ◽  
Y.N. Wu ◽  
C. Sun ◽  
J.B. Li
Keyword(s):  
Stress Analysis ◽  
Fracture Strength ◽  
Analysis Method ◽  
X Ray ◽  
Ceramic Film

MECHANICAL PROPERTIES AND RESISTANT MECHANISM AROUND BEARING JOINT BETWEEN PLYWOOD AND BOLT OF BUILDING STRUCTURES

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Haruka Kataoka ◽  
Takumi Ito
Keyword(s):  
Sandwich Panel ◽  
Resistance Mechanism ◽  
Stress Transfer ◽  
Transfer Mechanism ◽  
Fiber Direction ◽  
Building Structures ◽  
Analysis Method ◽  
Horizontal Resistance ◽  
Steel Column ◽  
Test Result

The authors have suggested a structural sandwich panel, in which a steel column is sandwiched between thick plywood connected by bolt joints. In a previous study the horizontal resistance mechanism and destructive properties of sandwich panels using structural plywood were clarified. This resistance mechanism is affected by the bolt layout of the sandwich panel. In this study, the bearing test of structural plywood was performed as a parameter with fiber anisotropy to investigate the bearing resistance, destructive properties, and stress transfer mechanism of structural plywood by the bearing joint between plywood and bolt. From the test result, the bearing resistance and destructive properties were clarified, and an analysis method was proposed to calculate the bearing strength. The destructive properties and stress transfer mechanism of structural plywood differ according to the fiber anisotropy. During the installation of the sandwich panel, it was found that the fiber direction of the plywood due to the bearing resistance was related to the destructive properties.

Environmental cell studies of deformation and fracture

1990 ◽  
Vol 48 (4) ◽  
pp. 516-517
Author(s):  
H. K. Birnbaum ◽  
I. M. Robertson
Keyword(s):  
National Laboratory ◽  
Argonne National Laboratory ◽  
Damage Threshold ◽  
Chromatic Aberration ◽  
Good Choice ◽  
Point Of View ◽  
Deformation And Fracture ◽  
Environmental Cell ◽  
Gas Molecules ◽  
The University

Studies of the effects of hydrogen environments on the deformation and fracture of fcc, bcc and hep metals and alloys have been carried out in a TEM environmental cell. The initial experiments were performed in the environmental cell of the HVEM facility at Argonne National Laboratory. More recently, a dedicated environmental cell facility has been constructed at the University of Illinois using a JEOL 4000EX and has been used for these studies. In the present paper we will describe the general design features of the JEOL environmental cell and some of the observations we have made on hydrogen effects on deformation and fracture.The JEOL environmental cell is designed to operate at 400 keV and below; in part because of the available accelerating voltage of the microscope and in part because the damage threshold of most materials is below 400 keV. The gas pressure at which chromatic aberration due to electron scattering from the gas molecules becomes excessive does not increase rapidly with with accelerating voltage making 400 keV a good choice from that point of view as well. A series of apertures were placed above and below the cell to control the pressures in various parts of the column.

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