An investigation of the effects of history dependent damage in time dependent fracture mechanics, Phase 1, constant load conditions. Progress report
In the following section a brief review of constitutive models is presented along with the implications of using them in creep crack growth studies under variable loads. The model searched for this study, is discussed along with is special features that make is particularly suitable for this investigation. This model is based on the creep hardening surface and is particularly useful for variable and fully reversed load histories. In Section 3 an implicit finite element algorithm for this model is derived. Details regarding implementation of this method into FVP and existing FE program to study creep crack growth, are also discussed. The results of the algorithm are verified against closed form solutions for simple geometries in Section 4. Sources of error and differences between using explicit and implicit schemes are also presented. Section 5 compares the numerical results with experimental data for the case of combined tension and torsion and fully reversed load histories. Section 6 provides results of some of the constant load creep crack growth analyses that have been performed to date. Because a wealth of experimental data has been developed for creep crack under constant load conditions, the need to develop our own creep growth data for this study was minimal. Conclusions of the Phase 1 work as well as work planned for the future are discussed in Section 7. Finally, Sections 8 and 9 discuss publications and the Phase 2 effort, respectively. Finally, the implementation of large strain and friction/contact algorithms into the finite element code and the implementation of three additional non-linear constitutive laws and the Walker Model are not discussed here. The large strain algorithm is complete, the endochronic theory is nearly complete, while subroutines for the Bodner and Walker models were obtained from the agencies described above.
- Research Organization:
- Battelle Memorial Inst., Columbus, OH (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-90ER14135
- OSTI ID:
- 10106306
- Report Number(s):
- DOE/ER/14135-T1; ON: DE92004428
- Resource Relation:
- Other Information: PBD: 14 Nov 1991
- Country of Publication:
- United States
- Language:
- English
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