Finite element implementation of Puck’s failure theory for fibre-reinforced composites under three-dimensional stress

A two-step finite element framework is presented that examines the effect of microscale thermal residual stress on the nanoindentation properties of fibre-reinforced composites. Firstly, micromechanical modelling is used to determine the residual stress state following thermal cooldown of a carbon-fibre composite material from cure temperature. A three-dimensional finite element nanoindentation model is then used to characterise the effects of residual stress on material properties determined by nanoindentation theory. The results show that the hardness of the matrix pockets decreases following thermal cooldown due to the existence of equibiaxial tensile residual stresses. The hardness property is also found to decrease for the majority of interfacial region stress states, while the microstructural areas where the effects of the residual stress are nullified are determined. The indentation modulus property is relatively insensitive to the microstructural residual stress, and thus is the recommended indentation property to be determined when carrying out a comparative parametric analysis between microstructural regions. The property changes are shown to be insensitive to any errors associated with contact area estimation using the Oliver and Pharr method.

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Application of the Puck failure theory for fibre-reinforced composites under three-dimensional stress: Comparison with experimental results

Journal of Composite Materials ◽

10.1177/0021998312462158 ◽

2013 ◽

Vol 47 (6-7) ◽

pp. 827-846 ◽

Cited By ~ 29

Author(s):

H Matthias Deuschle ◽

Alfred Puck

Keyword(s):

Three Dimensional ◽

Experimental Results ◽

Reinforced Composites ◽

Failure Theory ◽

Fibre Reinforced Composites

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Calculation method of belt material parameters for finite element tire model

Proceedings of the Institution of Mechanical Engineers Part D Journal of Automobile Engineering ◽

10.1177/09544070211042248 ◽

2021 ◽

pp. 095440702110422

Author(s):

Lu Zhang ◽

Shaohua Wang ◽

Bing Li

Keyword(s):

Finite Element ◽

Calculation Method ◽

Complex Structure ◽

Three Dimensional ◽

Anisotropic Elasticity ◽

Dynamic Responses ◽

Reinforced Composites ◽

Tire Model ◽

Material Parameters ◽

Vehicle Dynamic Simulation

The radial tire belt is composed of multi-layered fiber-reinforced cords with a very complex structure. Restricted by the computing speed, the simplified finite element (FE) tire model with equivalent belt is usually applied in the vehicle dynamic simulation. However, it is always difficult to obtain the material parameters of the equivalent belt. In this paper, a calculation method of equivalent belt material parameters for the simplified FE tire model is proposed based on the three-dimensional (3-D) anisotropic elasticity of the cord reinforced composites. The simulation results of the static radial stiffness, modal characteristics, and dynamic responses for the simplified FE tire model with parameters obtained by the calculation method were compared with experiment results. The results show that the deviation between the experiment and simulation is acceptable, and the validity of the calculation method is verified.

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