China
Africa
Explore chapters and articles related to this topic
Further Fracture Mechanics Applications
Published in Cameron Coates, Valmiki Sooklal, Modern Applied Fracture Mechanics, 2022
Cameron Coates, Valmiki Sooklal
DTA defines a safe growth period (a period of unrepaired service usage) based on the design life requirement for the component and/or scheduled in-service inspection intervals. The residual strength is defined as the static load that the structure can sustain without failure, in the presence of a crack. Residual static strength generally decreases with increased damage size. Figure 5.3 shows crack size increasing as residual strength decreases with an increasing number of cycles. The time available for inspection is limited by some minimum residual strength requirement.
Fire Resistance
Published in Mavis Sika Okyere, Fixed Offshore Platforms, 2018
Residual strength is the load or force that a damaged object or material can still carry without failing. Material toughness, fracture size and geometry, as well as its orientation, all contribute to residual strength. Residual strength is a measure of the platform's ability to sustain damage without failure (Bea 1991).
Evaluation of coarse-grained mechanical properties using small direct shear test
Published in International Journal of Geotechnical Engineering, 2021
SeyedArmin MotahariTabari, Issa Shooshpasha
The residual strength is the amount of the shear strength which remains after failure. In this study, the shear strength value corresponding to the 15% strain is taken as the soil residual strength. The stress–strain curves show that the residual stress roughly remains constant for the same specimen type with different relative densities. Therefore, it can be concluded that the soil residual strength is independent from its relative density in high strains, which is also observed in previous studies. In fact, in large deformations, both critical stress and the void ratio reach to a value that is independent from the initial void ratio. In these circumstances, shear strain increases, while shear stress is constant. This state is referred to as the critical state, steady state, or residual strength. Residual shear strength versus specimen type, for all tests, is illustrated in Figure 10. It is clear that residual strength generally decreases as the specimen size becomes smaller.
Studies on shape memory alloy-embedded GFRP composites for improved post-impact damage strength
Published in International Journal of Crashworthiness, 2019
Amit Kumar Gupta, R. Velmurugan, Makarand Joshi, N. K. Gupta
The first concept of using shape memory alloy hybrid composites (SMAHCs) was given by Roger and Robertshaw [6]. They have studied the performance of graphite/bismalemide and glass/epoxy composites for the low-velocity impact. Through their study, they have found improvement in perforation energy of NiTi/graphite composites over the graphite/epoxy host composites. A detailed review on SMAHCs for damage suppression properties against impact loading is given by Angioni et al. [7], in which they have discussed about the active and passive damage suppression mechanism of SMAHCs. Active damage suppression is achieved by using shape memory property of SMA, where SMA is heated to regain its original shape whereas in passive damage suppression mechanism, pseudoelastic property of SMA is utilised for damage mitigation. But active damage mechanism is difficult to implement as heating of SMA wire is very difficult to implement in engineering composite structures and also heating affects the properties of surrounding polymer matrix. Passive damage mechanism is cheaper and also easy to implement on composite structures as no external intervention like heating is required for stress induced transformation. Kiesling [8] had done low-velocity impact studies on graphite/bismalemide laminates embedded with unidirectional and bidirectional superelastic NiTi fibres. The author observed that energy absorption after peak loads was greatly increased in bidirectional SMA hybrids than unidirectional SMA hybrids. Researchers had also studied the behaviour of SMAHC under different operating conditions. The behaviour of SMAHC subjected to impact at low temperatures was studied by Ki-Wong kang and Kim [9]. They have studied glass epoxy embedded with SMA at different low temperatures (233–299 K). They have found that as compared to residual modulus, residual strength is more affected by temperature and impact damages.