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Calculation of sub-surface-initiated fatigue fractures in gears
(CIMNE, 2019)
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Power-transmitting gears are typically heat-treated, most often case-hardened, to improve the fatigue strength and therefore to ensure higher fatigue life. The heat treatment causes higher hardness in the surface area as ...
Macroscopic fe-simulation of residual stresses in thermo-mechanically processed steels considering phase transformation effects
(CIMNE, 2019)
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Residual stresses are an important issue as they affect both the manufacturing processes as well as the performance of the final parts. Taking into account the whole process chain of hot forming, the integrated heat treatment ...
Extended concept of representative directions to describe inelastic behaviour of electrospun polymers
(CIMNE, 2019)
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The concept of representative directions allows one to generalize onedimensional uniaxial material models to more general constitutive equations, suitable for arbitrary multi-axial loading scenarios. The procedure preserves ...
The brezis-ekeland-nayroles minimization principle with mixed finite element method for elastoplastic dynamic problems
(CIMNE, 2019)
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We propose a modification of the Hamiltonian formalism which can be used for dissipative systems, the Brezis-Ekeland-Nayroles principle. The formalism is specialized to the standard plasticity in small strains and dynamics. ...
Numerical evaluation of wearing pressure and cloth stiffness on vibration of human skeletal muscle during athletic movement
(CIMNE, 2019)
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In the design of sportswear which is expected to modify the performance of athletes, it is important to clarify the effects of the wear's rigidity and wearing pressure on the vibrations during exercise because they have ...
Elaboration and study of the thermo-mechanical properties of an aligned cnt - polypropylene nanocomposite by twin-screw mixer
(CIMNE, 2019)
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This study presents first the fabrication of a nanocomposite material based on Multi-Walled Carbon Nanotubes, and on a thermoplastic polymer matrix. First, a twin-screw mixer had been employed for preparing polypropylene ...
Durability evaluation of madake bamboo by FE analysis of fracture with consideration of fibre direction
(CIMNE, 2019)
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The flexural stiffness of bamboo is inherently influenced by heterogeneous material characteristic owing to its unique hierarchical structure. In addition, low interfacial strength and unequal distribution of fibres lead ...
Plastic dislocation and incompatibility density as indicators for residual stresses
(CIMNE, 2019)
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Residual stresses in forming simulations are typically investigated by analyzing the remaining stress state after removing all external loadings. However, the generation of the stress state during forming remains unknown. ...
A quasi-static nonlinear analysis for assessing the fire resistance of 3d frames exploiting time-dependent yield surface
(CIMNE, 2019)
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In this work an automatic procedure for evaluating the axial force-biaxial bending yield surface of reinforced concrete sections in fire is proposed. It provides an accurate time-dependent expression of the yield condition ...
Temporal characterization of rock dynamic destruction
(CIMNE, 2019)
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Dynamic strength tests published in literature have been analysed by structuraltemporal damage criteria. Parameter τ - incubation time - describing material stability behaviour under high-rate influences have been estimated ...