Efficient 3D and 2D failure conditions for UD laminae and their application within the verification of the laminate design

Cuntze, R.

doi:10.1016/j.compscitech.2004.12.046

Cited by 40 publications

(36 citation statements)

References 10 publications

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“…In addition to the five strength values, equation (6) indicates that two friction-related model parameters ðb ?jj , b ? Þ are needed for the analysis.…”

Section: Fmc-based Failure Conditions and Their Interactionmentioning

confidence: 99%

The predictive capability of failure mode concept-based strength conditions for laminates composed of unidirectional laminae under static triaxial stress states

Cuntze¹

2012

Journal of Composite Materials

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This paper represents the author's contribution to the second world-wide failure exercise using his failure mode concept modelling capability. The second world-wide failure exercise deals with the behaviour of isotropic material and unidirectional as well as multidirectional unidirectional laminae-composed laminates subjected to three-dimensional (triaxial) states of stress. Twelve challenging test cases were provided by the organisers and those covered stress-strain curves and failure envelopes under three-dimensional stress states. The application of the new failure mode concept model has extended the three-dimensional modelling by taking into account the effects of hydrostatic pressure and second glass temperature shift factor on the stress-strain curves and failure envelopes. The failure mode concept model was capable of successfully solving the majority of all the problems and a comparison between the predictions and test data is planned to be published in Part B of the second world-wide failure exercise.

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“…In addition to the five strength values, equation (6) indicates that two friction-related model parameters ðb ?jj , b ? Þ are needed for the analysis.…”

Section: Fmc-based Failure Conditions and Their Interactionmentioning

confidence: 99%

The predictive capability of failure mode concept-based strength conditions for laminates composed of unidirectional laminae under static triaxial stress states

Cuntze¹

2012

Journal of Composite Materials

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“…Beyond the stress level of r xx % 80 MPa, the softening of the embedded layer causes a physically premature decrease of the computed laminate stiffness. It is a matter of common knowledge that the constitutive behavior of a single UD-layer differs from that of the same layer being part of a laminate structure (see Cuntze, 2006). Experiments reveal that the embedded lamina withstands higher loading than the isolated layer.…”

Section: Cross-ply Laminate Under Uniaxial Tensile Loadingmentioning

confidence: 97%

Coupled twoscale analysis of fiber reinforced composite structures with microscopic damage evolution

Kurnatowski

Matzenmiller

2012

International Journal of Solids and Structures

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a b s t r a c tThe simultaneous twoscale analysis of unidirectionally fiber reinforced composite structures with attention to damage evolution is the objective of the contribution. The heterogeneous microstructure of the composite represents the microscale, whereas the laminate or the structural component are addressed as the macroscale. The macroscale is conventionally discretized by the finite element method (FEM). The generalized method of cells (GMC) in its efficient stress based formulation serves as the discrete microscale model. The stiff and brittle fibers behave linearly elastic. The epoxy resin is described by the nonlinear-elastic model of Ramberg-Osgood. By introducing microcrack models, the damage of the epoxy matrix under combined tensile and shear loading is taken into account. The cell boundaries of the micromodel are used to locate microscopic cracks deterministically. Interface models for the representation of damage in the matrix phase as well as for the weakening of the fiber-matrix-bond are used. This approach circumvents the need for the regularization, as it would be necessary for continuum damage models with softening characteristics. Hence, the micromodel is numerically stable and convergent. The GMC allows to obtain the consistently linearized constitutive tensor in the case of nonlinear material behavior in a simple and straight forward manner which is easily implemented in comparison to micromodels based on the finite element technique. The damage evolution on the microscale manifests itself macroscopically in the degradation of the homogenized stiffnesses.

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“…In contrast to the Tsai-Wu criterion, the discrimination of failure modes is the starting point of the Cuntze failure mode concept [10]. According to the underlying microstructural transverse isotropy with five independent elastic stiffnesses, Cuntze considers five different failure modes, each dominated by one corresponding value of strength.…”

Section: Stress-based Assessment Of Strengthmentioning

confidence: 99%

Available Theories for an Analysis of Stresses and Assessment of Strength of Laminate Structures

Becker

2014

Mech Compos Mater

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Theories for analyzing the stresses and strain in laminated structures and for assessment of their strength are briefly reviewed. In actual practice, a realistic assessment of strength, in many cases, still is a challenge, because in general, there are different failure modes in composite laminates that compete with each other. In addition, in laminate structures, situations with highly localized stresses frequently occur that cannot be assessed by employing a pure stress-based strength-of-materials approach. Sometimes, the stress localizations go along with a high, but finite, stress concentration, and sometimes it goes along with stress singularities, which, within the scope of elasticity theory, means infinitely high stresses. A promising way to predict the effective strength in such cases is the use of hybrid failure criteria within the framework of finite fracture mechanics. This approach is also considered in the present article.

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Efficient 3D and 2D failure conditions for UD laminae and their application within the verification of the laminate design

Cited by 40 publications

References 10 publications

The predictive capability of failure mode concept-based strength conditions for laminates composed of unidirectional laminae under static triaxial stress states

The predictive capability of failure mode concept-based strength conditions for laminates composed of unidirectional laminae under static triaxial stress states

Coupled twoscale analysis of fiber reinforced composite structures with microscopic damage evolution

Available Theories for an Analysis of Stresses and Assessment of Strength of Laminate Structures

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