... This paper studies the method for estimating the residual stress effects on brittle fracture of structural steel based on the Weibull stress criterion. First, brittle fracture tests were conducted for four-point bend notched specimens with and without compressive preloading. It is shown...

... used extensively for predicting the brittle fracture of ferritic RPV steels. The approaches developed combine the crystal plasticity finite element method (CPFEM) with continuum finite element analysis (FEA). CPFEM is applied to predict stress distributions at the microscale and to obtain phase...

... sections. Numerical simulation and experimental tests focused on the importance of this corner effect and the separate role geometry, yield strength, and fracture toughness on the total fracture strength of the joint. structural hollow section X-joint ductile fracture brittle fracture Journal...

... is performed using pointwise collocation and stochastic methods. The suitability of the calibration methods and overall model performance are evaluated and demonstrated. Brittle Fracture Beremin model Miniature Specimens Local Approach Transferability Anssi Laukkanen,~Kim Wallin,2Pekka Nevasmaa,t...

...-to-beam connections subjected to cyclic and dynamic loading. brittle fracture constraint effect transferability analysis fracture toughness fracture performance equivalent CTOD Weibull stress criterion structural steels Fumiyoshi Minami ~and Kazushige Arimochi 2 Constraint Correction...

... were used in the study. brittle fracture master curve miniature specimens validity testing Matti Valo, l Tapio Planman, 1Kim Wallin, l Ralf Ahlstrand, 2Jyrki Kohopiiii, z and Rauno Rintamaa I Validation of Miniature Fracture Toughness Specimens for Material Surveillance REFERENCE: Valo, M...

... to calibrate local approach models, which are then further applied to determine the attributes and usability of the different small specimens. brittle fracture ductile fracture miniature specimens local approach Kim Wallin, I AnssiLaukkanen, l andSeppo Tiihtinen l Examination on Fracture Resistance...

... The Master Curve method, developed for brittle fracture initiation estimation, has enabled a consistent analysis of fracture initiation toughness data. The method has been modified to also describe crack arrest toughness. Here, this “crack arrest master curve” is further validated and used...

... Effects of residual stresses induced in a three-point bend CTOD specimen on brittle fracture initiation are studied on the basis of the Local Approach. Compressive residual stresses are produced near the crack tip by preloading at room temperature. The material used is a 780 MPa class high...

... major advances in the development of standards applied to ceramics in which ASTM has played a major role. Unfortunately, we still have not learned to design with brittle ceramics and the cost of their utilization in structural applications remains prohibitively high. brittle fracture ceramics...

... considering the strain rate effect on the flow properties of materials. Temperature rise caused by high-speed plastic deformation is also included in the FE analysis. The critical CTOD at brittle fracture initiation decreases when increasing the loading rate. This is due to the elevation of a local stress...

... specimens brittle fracture ductile tearing constraint reactor pressure vessel steels size effects Charpy KLST Tapio Planman, 1Markku Nevalainen, 1Matti Valo, 1and Kim Wallin 1 APPLICABILITY OF SUB-CHARPY-SIZE BEND AND IMPACT SPECIMENS FOR ESTIMATION OF FRACTURE TOUGHNESS IN THE TRANSITION REGION...

... toughness of a coupon depends on the residual stress present. In this paper, we employ a micromechanical failure theory (the RKR model) to predict brittle fracture loads for three-point bend samples with and without triaxial residual stress. Finite element modeling is used in the study to introduce...

... on specimen constraint. The fracture resistance curves measured with 5*10 mm specimens give a good technical estimation for the larger specimen R-curves. Fracture toughness small specimens brittle fracture ductile tearing constraint reactor pressure vessel steels size effects M.Valo l...

... Variation of apparent fracture toughness under predominantly (elastic) brittle fracture is investigated. Williams' asymptotic series solutions, including higher order terms, are used to characterize the crack tip stress and strain fields for various specimen geometries. Using a fracturing stress...

... elements combined with the front solver made it possible to conduct analyses of 3D multiple cracks with personal computers. Secondly, an evaluation method for multiple surface cracks is discussed based on the NSIF values from this study. brittle fracture multiple cracks surface cracks quasi...

... of ductile fracture and an increased resistance to the initiation of unstable crack propagation at any given temperature in the lower-shelf regime. High-strength steels grain-refining precipitates ductile fracture brittle fracture impact toughness instrumented impact testing Michael J. Leap...

... to trigger low stress brittle fractures in both notched and welded wide plate tension tests, and welded structures in service. Although the relative susceptibilities of steels to strain ageing embrittlement are sometimes assessed by testing bulk strained and aged samples, the results of such tests may...

... estimates is excellent, even with specimens that clearly violate even the least stringent size requirements. fracture toughness brittle fracture size criterions constraint validity small specimens size effects KimWallin I VALIDITY OF SMALL SPECIMEN FRACTURE TOUGHNESS ESTIMATES NEGLECTING...

... achieved. silicon nitride brittle fracture stochastic subcritical crack growth process zone Monte Carlo method scatter M i c h a e l Gorelik I, A n t h o n y M. Calomino 2, and A l e x a n d e r C h u d n o v s k y I EXPERIMENTAL AND ANALYTICAL STUDIES OF CRACK INITIATION AND ARREST IN HOT...