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Title: Modeling damage in composites using the element-failure method
Keywords: Element-failure method, Strain Invariant Failure Theory, Progressive Damage, Material Property Degradation
Issue Date: 1-Sep-2005
Citation: TAN HWEE NAH, SERENA (2005-09-01). Modeling damage in composites using the element-failure method. ScholarBank@NUS Repository.
Abstract: Progressive damage in composites is traditionally modeled using material property degradation methods (MPDM), which assumes that a damaged material can be replaced with an equivalent material with degraded properties. In this thesis, a new damage-modeling technique known as the Element-failure method (EFM) is proposed, which assumes that the nodal forces of an element of a damaged composite material can be modified to reflect the general state of damage and loading. A comparison study of EFM and MPDM is illustrated in the case of progressive damage analysis of a composite laminate subjected to quasi-static three-point bend. Coupled with a micromechanics-based strain invariant failure theory (SIFT) for the first time, the results show that the use of the EFM with SIFT is a more suitable combination for mapping damage initiation and propagation in composite laminates. The finite element formulations of the EFM and the MPDM also show the EFM to be a more general and versatile method than the MPDM as the shortcomings of the MPDM are absent in the EFM.
Appears in Collections:Ph.D Theses (Open)

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