Failure simulations of open-hole IM7/977-3 coupons subjected to fatigue loading using Autodesk Helius PFA

Abstract

Finite element simulations of three laminates in open-hole configuration subjected to constant amplitude tension–tension fatigue loading are investigated as part of the Damage Tolerant Design Principles program organized by the Air Force Research Laboratory. All coupons were made from unidirectional IM7/977-3 plies, which are composed of intermediate modulus carbon fibers and a toughened epoxy matrix. Government furnished experimental data from an assortment of fatigue loaded unnotched coupons were used to characterize the behavior of the composite material in the simulations. The commercial software Autodesk Helius PFA was used to model the non-linear response of the material. Blind simulations of coupon stiffness and damage at several cycle numbers and residual coupon tensile and compressive strengths are benchmarked against experimental measurements and X-rays. Upon review of the experimental results, a second round of simulations was performed where the modeling strategy was updated to improve correlation to experiment.

Keywords

Composite fatigue progressive damage Helius strength prediction

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References

Hinton

Kaddour

Soden

. Failure criteria in fibre reinforced polymer composites: The world-wide failure exercise, 1st ed. Oxford: Elsevier, 2004.

Zhurkov

. Kinetic concept of the strength of solids. Int J Fract Mech 1965; 1: 311–323.

Zhurkov

Kuksenko

. The micromechanics of polymer fracture. Int J Fract 1975; 11: 629–639.

Coleman

. Time dependence of mechanical breakdown in bundles of fibers. I. Constant total load. J Appl Phys 1957; 28: 1058–1064.

Coleman

Marquardt

. Time dependence of mechanical breakdown in bundles of fibers. II. The infinite ideal bundle under linearly increasing loads. J Appl Phys 1957; 28: 1065–1067.

Coleman

. Time dependence of mechanical breakdown phenomena. J Appl Phys 1956; 27: 862–866.

Regal

Tamuzh

. Fracture and fatigue of polymers and composites (survey). Mech Compos Mater 1977; 13: 392–408.

Kireenko

Leksovskii

Regel

. Polymer fractography and fracture kinetics. 3. Fractographic method of estimating the local heating at the ends of cracks in cyclically loaded polymers. Mech Compos Mater 1971; 7: 776–780.

Regel

Pozdnyakov

Amelin

. Investigation of the process of thermal and mechanical degradation of polymers using mass spectrometers. Review. Mech Compos Mater 1975; 11: 13–26.

10.

Regel

. Kinetic theory of strength as a scientific basis for predicting the lifetime of polymers under load. Mech Compos Mater 1971; 7: 82–93.

11.

Kireenko

Leksovskii

Regel

. Polymer fractography and fracture kinetics. 2. The relationship between fracture surface relief and the dependence of strength on time and temperature. Mech Compos Mater 1971; 7: 193–198.

12.

Hansen

Baker-Jarvis

. A rate dependent kinetic theory of fracture for polymers. Int J Fract 1990; 44: 221–231.

13.

Garnich

Hansen

. A multicontinuum theory for thermal-elastic finite element analysis of composite materials. J Compos Mater 1997; 31: 71–86.

14.

Garnich

Hansen

. A multicontinuum approach to structural analysis of linear viscoelastic composite materials. J Appl Mech 1997; 64: 795–803.

15.

Mayes

Hansen

. Multicontinuum failure analysis of composite structural laminates. Mech Compos Mater Struct 2001; 8: 249–262.

16.

Mayes

Hansen

. Composite laminate failure analysis using multicontinuum theory. Compos Sci Technol 2004; 64: 379–394.

17.

Dalgarno R and Robbins D. A comparison of discrete-layer fiber-aligned and conventional meshing approaches for progressive failure simulation of open hole composite panels. In: 44^th ISTC, Charleston, SC, 22–25 October 2012, SAMPE.