Topic
Fracture toughness
About: Fracture toughness is a research topic. Over the lifetime, 39642 publications have been published within this topic receiving 854338 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, the J-integral fracture toughness of polytetrafluoroethylene (PTFE) was investigated for a range of temperatures and loading rates employing the single specimen normalization technique, and it was found that crack propagation is strongly phase dependent with a brittle-to-ductile transition in the crack propagation behavior associated with the two room temperature phase transitions.
182 citations
TL;DR: In this article, the effect on fracture toughness of a crack inclined at an angle β to the plane of a plate, so that Mode I and Mode III crack surface displacements were present, was investigated using ASTM-type single-edge notch tension specimens made from two aluminium alloys and a tool steel.
182 citations
TL;DR: In this paper, a theoretical model for predicting elastic-plastic, plane strain stress distributions in notched bars under bend loading has been developed by combining the elastic solutions of Neuber with the slipline field solutions of Hill.
182 citations
TL;DR: In this article, the concept of effective grain size (d EFF ) is applied to ductile-to-brittle transition temperature, DBTT, for ultrafine ferrite/cementite (Uf-F/C), ferrite-pearlite (F/P), quenched (Q), and quench-and-tempered (QT) microstructures in a low carbon steel.
Abstract: To analyze the good toughness of ultrafine ferrite/cementite steels, the concept of effective grain size (d EFF ) is applied to ductile-to-brittle transition temperature, DBTT, for ultrafine ferrite/cementite (Uf-F/C), ferrite/pearlite (F/P), quenched (Q), and quench-and-tempered (QT) microstructures in a low carbon steel. The d EFF is determined to be 8, 20, 100, and 25 μm for Uf-F/C, F/P, Q, and QT, respectively. In F/P and Q, it is in accordance with the ferrite grain size and the prior austenite grain size, respectively. In QT, the d EFF fits the martensite packet size. In Uf-F/C, the ferrite grain size has a bimodal distribution and the larger grain size corresponds to the d EFF , which is the smallest among the four microstructures. In terms of the relationship between d EFF and DBTT, the Uf-F/C, Q, and QT microstructures can be placed into the same group and the F/P to a different one. Furthermore, the Uf-F/C has the highest estimated fracture stress among the four microstructures. These might be the result of the difference in the surface energy of fracture, namely the former is estimated to have a surface energy of 34.6 J/m 2 and latter a surface energy of 7.7 J/m 2 . Thus, the excellent toughness of the ultrafine ferrite/cementite steel can be attributed to the small d EFF and the high surface energy of fracture.
182 citations
TL;DR: The fractography revealed that the deviation of the crack path involved an area which was approximately 50-100 μm deep, which reflects the fact, that in the intact tooth, the multiple full thickness cracks commonly found in enamel do not typically cause total failure of the tooth by crack extension into the dentin.
Abstract: The present report is a study of the fracture behavior of the dentin-enamel complex, involving enamel, dentin, and the dentin-enamel junction (DEJ), that combines experimental design, computational finite element analysis, and fractography. Seven chevron-notched short-bar bovine DEJ specimens were utilized in this study. The general plane of the DEJ was approximately perpendicular to the fracture plane. All specimens were stored at 37°C and 100% relative humidity for 24 h prior to being tested. A fracture test set-up was designed for application of tensile load on the DEJ specimens to initiate a crack at the vertex of the chevron in the enamel, across the DEJ zone and into the bulk dentin. During fracture testing, a water chamber was used to avoid dehydration of the specimen. The results showed that the lower boundary value of the fracture toughness of the DEJ perpendicular to its own plane was 3.38 ± 0.40 MN/m1.5 and 988.42 ± 231.39 J/m2, in terms of KIC and GIC, respectively. In addition, there was an e...
182 citations