... strength recovery up to 63% of the strength for the virgin pipe. However, such a level of recovery cannot be achieved for ductility. The examination of specimens indicated that the exposure to primer created a core–shell structure on the cross section, of which the area ratio was independent of the drying...

... and an injector unit. Strain levels are of 2–3%, making the tubing fail by low cycle fatigue in around 100 wrap–unwrap cycles. As coiled tubing material generally behaves in a ductile manner at surface and down well temperatures, the R curve has to be known to make instability analyses. J-R curves were determined...

...Y. W. Kwon; K. S. Tan Strain rate affects the mechanical properties of ductile materials in terms of their stiffness and strength. In particular, yield and failure strengths and strains depend on the strain rate applied to the materials. When a metallic material is subjected to a typical dynamic...

...Sharif Rahman This paper presents a polynomial dimensional decomposition method for calculating the probability distributions of random crack-driving forces commonly encountered in elastic-plastic fracture analysis of ductile solids. The method involves a hierarchical decomposition...

...Vishnu Verma; A. K. Ghosh; G. Behera; Kamal Sharma; R. K. Singh The miniature disk bending test is used to evaluate the mechanical behavior of irradiated materials and their properties (e.g., yield stress and strain hardening exponent) to determine mainly ductility loss in steel due to irradiation...

...-9) and 22Cr–13Ni–5Mn (22-13-5). The testing methodology involves exposure of tensile specimens to high-pressure hydrogen gas at elevated temperature in order to precharge the specimens with hydrogen, and subsequently testing the specimens in laboratory air to measure strength and ductility. In all...

... one. The data are used to explore the validity of the geometrically similar scaling laws over a geometric scale range of 4. The experimental results are compared to the empirical equations for the impact perforation of plates and with theoretical rigid-plastic predictions for the large ductile...

...Jianzheng Zuo; Xiaomin Deng; Michael A. Sutton; Chin-Shan Cheng Crack tunneling is a crack growth feature often seen in stable tearing crack growth tests on specimens made of ductile materials and containing through-thickness cracks with initially straight crack fronts. As a specimen is loaded...

...Stuart Holdsworth The European Creep Collaborative Committee (ECCC) approach to creep data assessment has now been established for almost ten years. The methodology covers the analysis of rupture strength and ductility, creep strain, and stress relaxation data, for a range of material conditions...

..., it is demonstrated that the mean shear stress has very little influence on the fatigue limit of a notch-free ductile material under cyclic torsional loading. When the torque versus angle of rotation stabilizes after only a few cycles, the alternating stress will become a constant regardless of the value...

... pipes, the static absorbed energy for ductile cracking, ( C vs ) i , was introduced as representing the fracture toughness of a pipe material. The ( C vs ) i value was determined from the microscopic observation of the cut and polished Charpy V-notch specimens after static three-point bending tests...

...-plastic analysis, and thermal stress ratchet. Issues that are explored are separating primary and secondary stresses in finite element analyses, material ductility requirements, and the meaning of the fatigue penalty factor. Since 3 S m is equivalent to 2 S y the design...

... and heterogeneous Arcan-type specimens are presented. Creep ductility-based damage models are used to predict the initial crack propagation trajectory. Incorporation of functionally graded transition layer regions was determined to affect the evolution of time-dependent stress components in the vicinity...

... (Subsection NE) and ferritic steel component supports (Subsection NF). Unlike Section VIII Division 1, Appendix R does not directly specify the minimum temperature; instead, that minimum temperature is referenced to a characteristic property of the ferritic material—its nil-ductility transition (NDT...