scholarly journals An Analytical Model to Predict Fracture of Off-Axis Unidirectional Composites

2002 ◽  
Vol 11 (5) ◽  
pp. 096369350201100
Author(s):  
J. Petermann ◽  
A. Plumtree ◽  
K. Schulte
Keyword(s):  
Analytical Model ◽  
Stress Component ◽  
Tensile Loading ◽  
Uniaxial Tensile ◽  
Homogeneous Material ◽  
Stress Distributions ◽  
Material Behaviour ◽  
Unidirectional Composites ◽  
Failure Initiation ◽  
Good Agreement

An analytical model based on isotropic homogeneous material behaviour is proposed to predict fracture in unidirectional composites under general loading. The model calculates the internal stress distribution corresponding to the applied load. In conjunction with the respective strength values, the model is capable of assessing the dominant stress component for failure initiation. For uniaxial tensile loading a comparison of calculated analytical stress distributions reasonably agrees with results from FE-analysis. A comparison of the analytical predictions with fractographic results for different off-axis angles provides good agreement.

Two-Dimensional FEM Stress Analysis of Adhesive Butt Joints Filled With Nano-Composite in Adhesive Subjected to Static Tensile Loading

2011 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Shougo Tanabe ◽  
Takashi Kobayashi ◽  
Kazunari Kotajima ◽  
Yasuhisa Sekiguchi
Keyword(s):  
Joint Strength ◽  
Tensile Loading ◽  
Stress Distributions ◽  
Filling Rate ◽  
Butt Joints ◽  
Nano Composite ◽  
Maximum Value ◽  
Static Tensile Loading ◽  
Static Tensile ◽  
Good Agreement

The interface stress distributions and the stress distributions around fillers in adhesive butt joints including fillers under static tensile loading are analyzed using Finite Element Method (FEM). The effects of stiffness, size and filling rate of fillers on the interfaces stress distributions and the stress distribution around the fillers are examined in the FEM calculations. It is seen that the maximum value of the stress around the edge of the adhesive interface decreases as the filling rate increases, while the stress around the fillers increases. The result shows that the joint strength increases more than that of the joints without fillers when the filling rate is lower (around 10 weight %). In addition, it is observed that the joint strength decreases at high filling rate. For verification of the FEM calculations, experiments were carried out to measure the joint strength. The analytical results are in a fairly good agreement with the experimental results.

A strain based criterion to assess ductile failure initiation in dented pipelines under tensile loading

2020 ◽  
pp. 030932472097527
Author(s):  
Yerlin Andres Plata Uribe ◽  
Claudio Ruggieri ◽  
Mitsuru Ohata
Keyword(s):  
Ductile Failure ◽  
Tensile Loading ◽  
Tensile Failure ◽  
Void Coalescence ◽  
Tubular Specimen ◽  
Cracking Behavior ◽  
Failure Initiation ◽  
Tension Tests ◽  
Bend Tests ◽  
Good Agreement

This work addresses the problem of describing ductile fracture behavior and predicting ductile failure initiation in dented pipelines under tensile loading based upon a 3-D computational cell approach coupled with a stress-modified, critical strain (SMCS) criterion for void coalescence. A series of tension tests conducted on notched tensile specimens with different notch radius for a carbon steel pipe provides the stress–strain response of the tested structural steel from which the SMCS criterion is calibrated. Full scale cyclic bend tests also performed on a 165 mm O.D tubular specimen with 11 mm wall thickness enable verification of the proposed approach in assessing ductile cracking behavior in damaged pipelines. These exploratory analyses predict the tensile failure load for the pipe specimen associated with ductile crack initiation in the highly damaged area inside the denting and buckling zone which are in good agreement with experimental measurements.

Heat and Mass Diffusion Including Shrinkage and Hygrothermal Stress during Drying of Holed Ceramics Bricks

2011 ◽  
Vol 312-315 ◽  
pp. 971-976 ◽  
Author(s):  
J. Barbosa da Silva ◽  
G. Silva Almeida ◽  
W.C.P. Barbosa de Lima ◽  
Gelmires Araújo Neves ◽  
Antônio Gilson Barbosa de Lima
Keyword(s):  
Moisture Content ◽  
Three Dimensional ◽  
Average Moisture Content ◽  
Stress Distributions ◽  
Drying Process ◽  
Convective Boundary ◽  
Volume Method ◽  
Hygrothermal Stress ◽  
Thermo Physical Properties ◽  
Good Agreement

The Aim of this Work Is to Present a Three-Dimensional Mathematical Modelling to Predict Heat and Mass Transport inside the Industrial Brick with Rectangular Holes during the Drying Including Shrinkage and Hygrothermalelastic Stress Analysis. the Numerical Solution of the Diffusion Equation, Being Used the Finite-Volume Method, Considering Constant Thermo-Physical Properties and Convective Boundary Conditions at the Surface of the Solid, it Is Presented and Analyzed. Results of the Temperature, Moisture Content and Stress Distributions, and Drying and Heating Kinetics Are Shown and Analyzed. Results of the Average Moisture Content and Surface Temperature of the Brick along the Drying Process Are Compared with Experimental Data (T = 80.0oC and RH = 4.6 %) and Good Agreement Was Obtained. it Was Verified that the Largest Temperature, Moisture Content and Stress Gradients Are Located in the Intern and External Vertexes of the Brick.

Sign in / Sign up

Export Citation Format

Share Document