A micromechanics based model for rate dependent compression loaded unidirectional composites

Singh, Vivekendra; Larsson, Ragnar; Olsson, Robin; Marklund, Erik

doi:10.1016/j.compscitech.2022.109821

Cited by 2 publications

(18 citation statements)

References 32 publications

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“…These parameters are defined by the stresses σ t and σ c as defined in. 22,23 A Perzyna-type Bingham model is adopted for viscoplasticity. λ is the viscoplastic multiplier defined as…”

Section: Evolution Rulesmentioning

confidence: 99%

“…where t * is the viscoplastic relaxation time and η is the Bingham overstress function. Following, 22,23 the progression of α for the damage degradation function f [α] in equation ( 2) is rate-dependent and is driven by viscoplastic dissipation in the matrix. The damage evolution is defined as…”

Section: Evolution Rulesmentioning

confidence: 99%

“…α stat represents the source of damage energy due to inelastic deformation. A T is the damage driving energy consisting of only plastic work B, obtained by reformulating the dissipation rate D m in 22,23 in the total dissipation defined as…”

Section: Evolution Rulesmentioning

confidence: 99%

“…[18][19][20] Larsson et al 21 proposed a micromechanics-based model dependent on the strain rate for unidirectional polymer composites at the ply level. This model was later extended to include the continuum damage formulation 22 and was applied to different material systems 23 to demonstrate the robustness of the model. In the model, the polymer matrix is assumed to be viscoelastic-viscoplastic with damage, whereas the carbon fibres are transversely isotropic elastic.…”

Section: Introductionmentioning

confidence: 99%

“…Several shapes have been proposed for the involved traction-separation law, including bilinear, exponential 28 and trapezoidal laws. 29 The objective of this paper is to apply the strain rate-dependent damage model developed in 22,23 while including isotropic hardening to realistic multidirectional carbon/epoxy laminates with multiple layers subjected to static and dynamic compressive loading rates. The current model version 23 excludes damage growth in the viscoelastic range, included in, 22 as it was found to result in excessive softening in disagreement with experimental observations for typical epoxy resins.…”

Section: Introductionmentioning

confidence: 99%

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Rate dependent compressive failure and delamination growth in multidirectional composite laminates

Singh,

Larsson,

Olsson

et al. 2023

Journal of Composite Materials

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A novel intralaminar model has, for the first time, been applied and validated for the rate-dependent failure of multidirectional carbon/epoxy laminates. Quasi-static compressive failure is evaluated by the growth of intralaminar rate-dependent damage combined with the interaction of cohesive zones for interlaminar delamination. A special feature of the intralaminar model is the homogenised ply response, allowing simultaneous damage-degradation of the polymer matrix combined with the fibres. To model the observed quasi-brittle failure response of the plies under finite deformation, we have used a viscoelastic-viscoplastic matrix combined with damage and isotropic hardening behaviour. Elastic transverse isotropy is used to model the fibre reinforcement of the plies. Standard cohesive surfaces are used to model the initiation and propagation of delamination. Numerical simulations using ABAQUS/Explicit are performed to predict the growth and delamination of intralaminar damage under compression in different laminates with 56 plies of IM7/8552 carbon/epoxy. Predictions of stress versus strain and damage growth are shown to agree well with experimental results for a range of strain rates and stacking sequences.

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“…These parameters are defined by the stresses σ t and σ c as defined in. 22,23 A Perzyna-type Bingham model is adopted for viscoplasticity. λ is the viscoplastic multiplier defined as…”

Section: Evolution Rulesmentioning

confidence: 99%

Section: Evolution Rulesmentioning

confidence: 99%

Section: Evolution Rulesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rate dependent compressive failure and delamination growth in multidirectional composite laminates

Singh,

Larsson,

Olsson

et al. 2023

Journal of Composite Materials

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Prediction Ability Analysis of Phenomenological Strength Criteria for Composites

Huang

2024

JES

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The article examines and assesses the phenomenological strength theory of composite materials. A comparative analysis of the theoretical envelopes was conducted for each criterion. A unified form of the phenomenological strength criterion was established. The study specifically examined the effects of altering the interaction parameter on the Tsai-Wu criterion’s theoretical envelope. Based on the available experimental data, the study plotted the failure envelopes of each strength criterion under planar composite stress states. The variation of these envelopes across various stress quadrants was highlighted. As a result of the examinations, four typical phenomenological strength criteria were chosen. The composites’ off-axis tensile and biaxial loading test data were used to evaluate the predictive power objectively. The results showed that not all stress states’ test results agreed with the predictions of the phenomenological strength theory. The criterion proposed by Norris and Tsai-Hill performed better at accounting for the material’s different compressive and tensile characteristics. The other criteria tended to be conservative under particular circumstances. Simultaneously, the Hoffman criterion matched the test data more closely over a broader range of stress states. Overall, this study clarified the limitations and applicability of various strength criteria in composite material strength prediction.

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A micromechanics based model for rate dependent compression loaded unidirectional composites

Cited by 2 publications

References 32 publications

Rate dependent compressive failure and delamination growth in multidirectional composite laminates

Rate dependent compressive failure and delamination growth in multidirectional composite laminates

Prediction Ability Analysis of Phenomenological Strength Criteria for Composites

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