Numerical Assessment of Compression Strength After Impact for Impact for Enhanced Aircraft Sustainment

Harman, Alex; Lua, Jim; Chang, Peng; Rapking, Daniel; Wright, C.P.; Phan, Nam; McQuien, Jeffrey S.; Iarve, Endel V.; Flores, Mercedes; Mollenhauer, David

doi:10.12783/asc34/31273

Cited by 3 publications

(6 citation statements)

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“…1) to focus on residual strength of composites with barely visible impact damage (BVID). The experimental testing was completed previously at Defence Science and Technology Group (DSTG) [19]. An intermediate-modulus carbon fibre with a toughened epoxy resin composite material system was used in this work, which is typical of new generation aircraft.…”

Section: Experimental Testingmentioning

confidence: 99%

“…• Model-1: dent and delamination zones only, as per the analysis in Ref. (19) • Model-2: dent, delamination and fibre fracture zones • Model-3: dent, delamination, fibre fracture and pseudo-impact…”

Section: Fea Modelsmentioning

confidence: 99%

“…A cohesive zone was applied between each ply. The mesh used was similar to that of previous studies [19] and is based on ensuring a suitably small length for proper operation of the damage models. Several other mesh refinements were investigated (Table 2).…”

Section: Finite Element Modelsmentioning

confidence: 99%

“…In previous work, Harman et al used BSAM TM to analyse the residual strength and damage behaviour of compression after impact specimens [19]. The analysis incorporated the impact-induced dent and delamination zones in each ply interface and achieved strength predictions within 4%.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper, the analysis strategy of Harman et al [19] is extended to include an out-of-plane displacement pre-load step to create a network of matrix cracking as part of the impact damage. A detailed investigation is conducted into capturing the fibre fracture from impact, in terms of developing a modelling strategy and the influence on the damage behaviour and residual strength.…”

Section: Introductionmentioning

confidence: 99%

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High-fidelity post-impact residual strength assessment for composite aircraft sustainment

Jacobs,

Harman,

Ladani

et al. 2023

Aeronaut. j.

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High-fidelity simulation tools have significant potential to support composite aircraft sustainment, though further study is required on incorporating the complex impact damage field. In this paper, compressive residual strength assessment is investigated using the high-fidelity computational tool BSAMTM. The experimental impact damage was mapped and modelled at a high-fidelity level, which included ply-by-ply definition of the geometry of the impact indentation, fibre fracture in the plies and delamination in ply interfaces. It was shown that applying a small lateral displacement or ‘pseudo-impact’ step was highly effective in generating matrix cracks in the impact region, which provided a suitably realistic representation of the interconnected damage map through-the-thickness. It was found that inclusion of all damage modes in the post-image damage map at a high-fidelity definition was essential due to the strong degree of interaction between damage modes. The results support improved sustainment of defence platforms, through enhanced predictive capability and understanding.

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Section: Experimental Testingmentioning

confidence: 99%

Section: Fea Modelsmentioning

confidence: 99%

Section: Finite Element Modelsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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