... Abstract The XFEM (Extended Finite Element Method) has emerged as a reliable tool for structural engineers to study fracture problems. This method was introduced in 1999 as an alternative to the solution of models with inclusions and discontinuities. As it is a recent method and despite being...

..., and discuss potential causes. explosion bonding cryogenic transition joint fracture strain induced austenitic stainless aluminum stainless steel nickel titanium Proceedings of the ASME 2022 Pressure Vessels & Piping Conference PVP2022 July 17-22, 2022, Las Vegas, Nevada, USA PVP2022-80411...

... is not well understood; therefore, the effect of gaseous H 2 on the mechanical properties of MDPE needs to be examined. In the current study, we investigate the effects of gaseous H 2 on fatigue life and fracture resistance of MDPE in the presence of 3.4 MPa gaseous H 2 . Fatigue life tests were also...

... Abstract This paper describes deterministic benchmark comparisons of 14 probabilistic fracture mechanics (PFM) codes. The benchmark problem focused on determining the leak-before-break behavior of a nickel-based alloy weld in a large-bore piping system of a pressurized-water reactor...

... and fracture toughness testing. Tensile testing with miniature specimens demonstrates a difference of over 50 MPa in the yield and ultimate tensile strengths of the RPVH and beltline materials. Beltline specimens tested at the operating temperature exhibit discontinuity past the yield region, possibly...

... makes it an attractive test given the ease of data generation to assess the suitability of a given material; however, the scatter in the data produced is significant and the test does not provide a value of fracture toughness. Quasi-static tests using high-constraint geometries (e.g. single-edge notch...

... Abstract This paper provides an overview of the conservatisms inherent in current fracture mechanics assessment methodologies and practices. This is mainly with respect to the UK R6 and BS7910 methodologies but several of the aspects considered will also be common to other methods. Where...

.... If these cracks cannot be detected at an early stage, there is a real potential for the vessel to rupture with obvious dangerous consequences. The behavior of fractured or geometric discontinuity structures can be investigated with linear elastic fracture mechanics (LEFM) parameters. The stress intensity factor...

... Abstract This work proposes a new test methodology to characterize the fracture toughness values for either brittle or ductile materials, such as steels of risers and pipelines used in the oil and gas industry by using non-standard four-point bending specimens. Four-point bending (4PB...

... Abstract We present VistaDam , a physics-based ductile fracture material model that is tailored to predict failure in thin metal sheets. VistaDam is based on a three invariant plasticity model in which metal fracture is dependent on the combined evolution of the triaxial stresses as well...

... Abstract To protect vessels and components against local fracture, fracture initiation strain limits are used as acceptance criteria. Based on the fracture strain model established from the Unified Strength Theory, this paper proposes fracture strain limits with only three model parameters...

... Abstract The inner surfaces of ferritic steel pressure vessels are often coated with a weld-deposited layer of austenitic cladding for the purpose of corrosion resistance. UK practice of assessing the defect tolerance by postulating defects in components leads to the requirement for a fracture...

... with each other, and the grain heights on the front surface were inversely correlated with those on the back surface. fracture polycrystalline pure titanium inhomogeneous deformation microscopic deformation height distribution thin sheet front and back surfaces MICROSCOPIC DEFORMATION OF THIN...

... of the new model are discussed in the context of improved accuracy and precision for crack assessments. failure fracture structural integrity VALIDATION OF THE NEW GAMMA EXPONENT MODEL FOR AXIAL CRACK ASSESSMENT IN OIL AND GAS PIPELINES Colin Scott IRISNDT Engineering Services Calgary, Alberta...

... Abstract It has been observed that steels which are operating in the ductile regime demonstrate greater resistance to tearing under conditions of reduced crack-tip constraint. Constraint is influenced by both geometry and load conditions. For example, fracture toughness specimens with shorter...

... was used to determine the appropriate fracture parameters to assist in this flaw assessment procedure. These computational efforts involved examining the fracture response of the system in preparation for planned inspections. Stress intensity factors were evaluated for a total of ten (10) cracks inserted...

... Abstract Friction Stir Spot Welding (FSSW) is a solid-state joining technique widely applied to high conductive metals. In this paper, the effects of FSSW parameters, namely, rotational speed (N), plunging rate (V) and dwell time (DT) on the joint fracture mode and fractured surface morphology...

.... The consistency between fitness-for-service (FFS) procedures and design requirements of pressure vessels is discussed in this work. As a key link between FFS procedures and design standards, the required material fracture toughness not only depends on the methods of FFS procedures such as failure assessment...

... and the location of the final fracture line was examined. It was found from these experimental results that the fracture tends to occur along the regions with low area fraction of fibers or along those with low area fraction of fiber/matrix boundaries. This fact suggests that the fracture location of SRPs...

... strain can be imposed across the flawed section in some cases. Recently, the present author has published a general approach to strain-based fracture that uses a strain-based failure assessment diagram (SB-FAD). This includes a range of Options similar to that of the basic R6 approach. The present paper...