IUTAM Symposium on Theoretical, Computational and Modelling by B. Daya Reddy

By B. Daya Reddy

This paintings includes papers according to many of the talks provided on the IUTAM Symposium of an identical identify, held in Cape city, January 14-18, 2008. This volume treats state of the art matters in modelling, the behaviour of assorted sessions of inelastic media, and linked algorithms for engaging in computational simulations. A key function of the contributions are works directed at modelling behaviour on the meso and micro-scales, and at bridging the micro-macro scales.

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Additional info for IUTAM Symposium on Theoretical, Computational and Modelling Aspects of Inelastic Media: Proceedings of the IUTAM Symposium Held at Cape Town, South Africa, January 14-18, 2008

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The specimen is fixed at its lower side. 25◦C is prescribed at the upper part. Mechanical loading is not considered. 80. The damage due to frost increases during the cooling process as expected. Since the effective material parameters vary randomly also the damage due to frost is not equally distributed. Damage starts directly at the upper surface. This is physically not completely true, here the damage is just beneath the surface due to frost suction. However the latter effect was not included in the present model and needs additional investigations at micro-structural level.

Jumps in the curves in Figure 5 result from small changes of the normal vector b. Due to hardening, all curves do not follow the same reversible paths. After the second cycle (with constant maximum cyclic deformation), the microstructure is frozen (λ ≈ 0). If, however, we admit large rotations and find bn+1 globally, then the stress-strain curve exhibits the behavior shown in Figure 5(d): The microstructure is not frozen and still evolves (with frequently changing b), hence producing the illustrated shifting stress-strain hystereses.

1 Numerical Simulation of Frost Damage Nonstationary heat conduction is now used within a themo-mechanical coupled numerical simulation at macro level to compute the damage of cement paste due to frost. 4 W/m K and thermal expansion αt = 10−5 1/K. The variation of the material and damage variables, as discussed above, are incorporated at Gauss point level within the finite element discretization. Material Characterization Based on Micro-Structural Computations & Homogenization 25 Fig. 9 Development of damage due to frost in a 40 × 40 × 160 mm specimen at times t = 1, t = 50 and t = 100.

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