In this regard, the dynamic nature of mobile crane operations entails a variety of outrigger reaction values for truck cranes and track pressure values for crawler cranes. Dynamic loading related to crane motion and load are the key factors associated with the failure to maintain stability. Stability is an important safety issues related to the use of mobile cranes. These results are based on simulation only, and need further experimental investigations and validation, which is ongoing. The results from the numerical parametric studies provide guidelines for designing heat straightening repairs, estimating final residual stresses, and evaluating the state (performance) of damaged-repaired steel bridges. Additionally, the effects of steel material and girder geometric properties, damage magnitude and location, and heating patterns and distribution are also evaluated. stresses, (b) serviceability, and (c) ultimate load capacity of composite steel girders and bridges. This approach is used to investigate the effects of damage followed by heat straightening repair on the: (a) residual. The paper presents an numerical approach for simulating the damage, and the heat straightening repair of composite steel bridge girders. This paper focuses on the heat straightening repair and rehabilitation of steel bridge girders damaged by collision with overheight trucks. Both nucleation and propagation lives in notched specimens were much shorter in impact fatigue than in non impact fatigue when compared at the same values of nominal stress and stress concentration factor. Fractographic observations with scanning electron microscopy and the X-ray diffraction technique revealed more abundant cleavage facets and a smaller spread of the plastic zone beneath the fracture surface made by impact fatigue.
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The growth rate of a fatigue crack in impact fatigue of notched specimens was higher than that in non-impact fatigue when compared at the same stress intensity factor. The fatigue life of smooth specimens was uniquely related to the range of plastic strain at the middle of the fatigue life in both impact and non-impact fatigue, although the characteristics of micro-structural deformation and cyclic stress-strain relationships were markedly different. The characteristic failure mechanisms in impact fatigue was discriminated by comparison with those in non-impact, ordinary fatigue. The presented hyperelastoplastic formulation can model both finite elastic and finite plastic strains.Ībstract Impact fatigue tests were performed with smooth and notched specimens of low carbon steels under various impact loading conditions. The numerical results show that, as expected, the analysis error can be controlled by mesh refinement. The results for the force versus displacement and the distributions of the plastic parameters are provided. Some structural problems have been numerically simulated, and convergence analysis is carried out. In both cases, the three-dimensional von Mises yield criterion, the associative plastic flow rule and mixed hardening are used. The second, called Green–Naghdi elastoplastic, is based on the additive decomposition of the Green–Lagrange strain tensor and the second Piola–Kirchhoff stress tensor, and it is devoted to small strain and is used as a reference to the second development. The first, called hyperelastoplastic, is based on the multiplicative decomposition of the deformation gradient, the intermediate configuration, and the elastic Mandel stress tensor, and it is devoted to large strain evolution. In order to do so, two elastoplastic formulations are developed and implemented. The motivation is to find a more precise stress distribution inside solids that develops large strains in elastoplastic situations. This strategy differs from usual ones adopted in literature that use low order and sub-integration methods to solve this kind of problems.
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This paper is concerned with the development and application of high order full integrated tetrahedral finite elements to large deformable elastoplastic homogeneous solids.
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