A Three-Dimensional Finite Element Analysis of the Double-Torsion Test

1979 ◽  
Vol 101 (4) ◽  
pp. 328-335 ◽  
Author(s):  
A. A. Tseng ◽  
J. T. Berry
Keyword(s):  
Fracture Toughness ◽  
Finite Element ◽  
Crack Length ◽  
Three Dimensional ◽  
Torsion Test ◽  
Test Method ◽  
Fracture Toughness Test ◽  
Element Analysis ◽  
Three Dimensional Finite Element ◽  
Double Torsion

A special three-dimensional crack-tip element has been developed to investigate a simple and widely applicable fracture toughness test method. Previous experimental work with the double-torsion method has shown that the use of a relatively thin sectioned specimen may be permitted. The section concerned is considerably thinner than that used in conventional techniques, while the technique also simplifies the determination of the fracture toughness parameter. K IC values, which are independent of the crack length, have been obtained for glasses, ceramics, polymers, and a variety of metals and alloys. The numerical solution presented is supportive of many experimental observations made during testing. Excellent correlation between the finite element and experimental results has been obtained. The maximum stress intensity factor is shown to be almost independent of crack length over a considerable range.

A New Test Method for Determining the Strength and Fracture Toughness of Cement Mortar and Concrete

2009 ◽  
Author(s):  
John Jy-An Wang ◽  
Ken C. Liu ◽  
Dan Naus
Keyword(s):  
Fracture Toughness ◽  
Three Dimensional ◽  
Computer Code ◽  
Cementitious Materials ◽  
Test Method ◽  
Fracture Toughness Test ◽  
Dimensional Finite Element ◽  
Materials Used ◽  
Torsion Fracture ◽  
Three Dimensional Finite Element

The Spiral Notch Torsion Fracture Toughness Test (SNTT) was developed recently to determine the intrinsic fracture toughness (KIC) of structural materials. The SNTT system operates by applying pure torsion to uniform cylindrical specimens with a notch line that spirals around the specimen at a 45° pitch. KIC values are obtained with the aid of an in-house developed three-dimensional finite-element computer code, TOR3D-KIC. The SNTT method is uniquely suitable for testing a wide variety of materials used extensively in pressure vessel and piping structural components and weldments. Application of the method to metallic, ceramic, and graphite materials has been demonstrated. One important characteristic of SNTT is that neither a fatigue precrack nor a deep notch are required for the evaluation of brittle materials, which significantly reduces the sample size requirement. In this paper we report results for a Portland cement-based mortar to demonstrate applicability of the SNTT method to cementitious materials. The estimated KIC of the tested mortar samples with compressive strength of 34.45 MPa was found to be 0.19 MPa √m.

Spiral Notch Torsion Test Use for Determining Fracture Toughness of Structural Materials

2012 ◽  
Author(s):  
Jy-An John Wang ◽  
Fei Ren ◽  
Ting Tan
Keyword(s):  
Fracture Toughness ◽  
Three Dimensional ◽  
Torsion Test ◽  
Computer Code ◽  
Structural Materials ◽  
Fracture Toughness Test ◽  
Materials Used ◽  
Torsion Fracture ◽  
Three Dimensional Finite Element ◽  
Spiral Notch

Spiral Notch Torsion Fracture Toughness Test (SNTT) was developed recently to measure the intrinsic fracture toughness (KIC) of structural materials. The SNTT system operates by applying pure torsion to uniform cylindrical specimens with a notch line that spirals around the specimen at a 45° pitch. The KIC values are obtained with the aid of a three-dimensional finite-element computer code, TOR3D-KIC. The SNTT method is uniquely suitable for testing a wide variety of materials used extensively in pressure vessel and piping structural components and weldments, including others such as ceramics, their composites, graphite, concrete, and polymeric composites. The SNTT test results for some of these structural materials are demonstrated in this paper.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

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