scholarly journals Characteristics of the double-torsion test to determine the R-curve of ceramic materials

2006 ◽  
Vol 9 (4) ◽  
pp. 361-368 ◽  
Author(s):  
Maria da Consolação Fonseca de Albuquerque ◽  
José de Anchieta Rodrigues
Keyword(s):  
Torsion Test ◽  
Ceramic Materials ◽  
Double Torsion

Using Torsion Bar Testing to Determine Fracture Toughness of Ceramic Materials

2002 ◽  
Author(s):  
J. A. Wang ◽  
K. C. Liu ◽  
G. A. Joshi
Keyword(s):  
Fracture Toughness ◽  
Crack Opening ◽  
Torsion Test ◽  
Ceramic Materials ◽  
Type Specimen ◽  
Small Region ◽  
Fracture Load ◽  
Test Method ◽  
Finite Element Program ◽  
Spiral Line

A new method, designated as Spiral Notch Torsion Test (SNoTT), is introduced for determining fracture toughness KIC of materials ranging from metallic alloys to brittle ceramics and their composites. A round-rod specimen having a V-grooved spiral line with a 45° pitch is subjected to pure torsion. This loading configuration creates a uniform tensile-stress crack-opening mode, Mode-I, with a transverse plane-strain state along the grooved line. This technique is analogous to the conventional test method using a compact-type specimen with a thickness equivalent to the full length of the spiral line. KIC values are determined from the fracture load and crack length with the aid of an in-house developed 3-D finite element program (TOR3D-KIC). A mixed mode (modes I and III) fracture toughness value can be determined by varying the pitch of the spiral line or varying the ratio of axial to torsion loads. Since the key information needed for determining KIC values is manifested within a small region near the crack tip, the specimen can be significantly miniaturized without the loss of generality. Limited results obtained for various materials are compared with published KIC values, showing differences of less than 2% in general and 6% maximum in one case. The experimental technique and theoretical basis of the proposed method are presented in detail.

Enhancement of the analytical solution for double torsion test using extended finite element techniques

2019 ◽  
Vol 45 (7) ◽  
pp. 9548-9559
Author(s):  
Karuppasamy Pandian Marimuthu ◽  
Kwangmin Lee ◽  
Felix Rickhey ◽  
Hyungyil Lee
Keyword(s):  
Finite Element ◽  
Analytical Solution ◽  
Torsion Test ◽  
Extended Finite Element ◽  
Double Torsion

The use of the double torsion test geometry to study the fracture of adhesive joints

1984 ◽  
Vol 3 (9) ◽  
pp. 776-778 ◽  
Author(s):  
A. C. Moloney ◽  
H. H. Kausch ◽  
H. R. Stieger
Keyword(s):  
Torsion Test ◽  
Adhesive Joints ◽  
Test Geometry ◽  
Double Torsion
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