Nonlinear Analysis of Woven Fabric-Reinforced Graphite/PMR-15 Composites under Shear-Dominated Biaxial Loads

Odegard, Gregory M.; Searles, K.; Kumosa, M.

doi:10.1080/107594100305348

Cited by 30 publications

(17 citation statements)

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“…For example, the combination of a 11 = a 12 = 0 and a 22 = 1 gives the one-parameter plastic potential used by Sun and Chen for unidirectional composites. 32 The combination of a 11 = a 12 = a 22 = 0 and a 66 = 1/2 gives the woven composite potential function used by Thiruppukuzhi and Sun 36 and Odegard et al., 44 which assumes linear behavior in both fiber directions. The combination of a 11 = a 22 = 2/3, a 12 = -1/3, and a 66 = 1 gives J 2 (i.e.…”

Section: Rate-dependent Constitutive Theory For Elastic-viscoplastic Responsementioning

confidence: 99%

High strain rate testing and modeling of a woven E-glass–vinylester composite in dry and saturated conditions

Hufner

Hill

2016

Journal of Composite Materials

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The behavior of a woven E-glass–Vinylester composite in dry and seawater-saturated conditions was investigated for strain rates in the range of 0.001–100 s −1. Reliable data were obtained by conducting servo-hydraulic tests at high speed with DIC strain measurement. Issues related to inertial effects of the test system and controlling vibrational stress waves were resolved through a unique experimental setup and special attention to specimen geometry and fixturing. In addition, a rate-dependent constitutive model was adapted to characterize the elastic–viscoplastic response at various strain rates and validated by comparison to test data. The subject investigation demonstrates a viable methodology to identify strain rate sensitivities in high speed experiments and develop a representative material model for analysis of high rate phenomena.

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Section: Rate-dependent Constitutive Theory For Elastic-viscoplastic Responsementioning

confidence: 99%

High strain rate testing and modeling of a woven E-glass–vinylester composite in dry and saturated conditions

Hufner

Hill

2016

Journal of Composite Materials

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“…From the previous 2-D studies of the Iosipescu test [15,[18][19][20], the coefficient of friction between the blocks and specimen contacting surfaces was chosen as 0.3.…”

Section: Specimen Typementioning

confidence: 99%

The Effect of Eccentric Loads on the Macroscopic Strain and Stress Distributions in Woven Fabric Composite Iosipescu Specimens

Searles

Odegard²,

Kumosa

2002

Journal of Composite Materials

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This paper documents the results of work undertaken to evaluate the effects of eccentric loading conditions on the surface shear strains and stress distributions in layered quasi-laminar composite Iosipescu specimens. It is known that poorly machined contact surfaces, thin specimens and misalignment between the fixed and movable portions of the fixture can lead to premature shear failure and erroneous strain readings. In this work, four potential types of eccentric loading modes, shear þ asymmetric torsion, shear þ anti-symmetric torsion, shear þ lateral bending and shear þ lateral rotation were defined in terms of ratios of the resultant moments derived from prescribed displacements. To study these types of load eccentricities, 3-D finite element models were proposed that included both the fabric plies and interfaces and allowed for geometric and boundary contact nonlinearities. The results suggest that a purely bimodal shear and torsion response of the Iosipescu specimen is not possible due to the anti-symmetry of the loading blocks with respect to the notch root axis. Rather, a trimodal response composed of shear, torsion and transverse bending will always occur as specimen loading becomes eccentric. The component of transverse bending tends to be largely responsible for the mismatch in strains on opposite faces of the specimen as well as more pronounced shear stress gradients through-thickness. It has also been shown in this research that the effect of eccentric loads on the through-thickness shear stress and strain gradients in the Iosipescu specimens depends very strongly on the loading block geometries.

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“…Fujii et al [15] have recommended the use of the 2nd Piola Kirchoff stress (instead of nominal stress) in the Tsai-Wu criterion for cases involving signifi cant yarn reorientation. Odegard et al [4] also recommend the use of 2nd Piola-Kirchoff stresses and the Green-Lagrange strain tensor when strains are large and deformation gradients are known. Espinosa et al [16] have formulated a complete theory in total Lagrangian coordinates in which the constitutive equations are expressed in terms of 2nd Piola Kirchoff stresses and Green-Lagrange strains.…”

Section: Introductionmentioning

confidence: 97%

Failure assessment of a woven E-glass/vinyl ester composite subjected to large deformation loading

Hufner

Xing

Accorsi

2012

Science and Engineering of Composite Materials

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Woven polymer-based composites exhibit highly non-linear behavior, which often results in very high strains to failure. A micromechanical model is developed to represent the large deformation kinematics of woven composites, and develop predictions for failure strain components in specifi c cases of multiaxial loading. Failure functions are proposed for macromechanical analyses of arbitrary cases of large deformation loading. The approach is validated against basic tension experiments performed using both digital image correlation and with specially designed instrumentation for large strain measurement. Predicted failure strains correspond well with experimental observations. The proposed failure functions are well suited for fi nite element applications involving user-defi ned material models.

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Nonlinear Analysis of Woven Fabric-Reinforced Graphite/PMR-15 Composites under Shear-Dominated Biaxial Loads

Cited by 30 publications

References 0 publications

High strain rate testing and modeling of a woven E-glass–vinylester composite in dry and saturated conditions

High strain rate testing and modeling of a woven E-glass–vinylester composite in dry and saturated conditions

The Effect of Eccentric Loads on the Macroscopic Strain and Stress Distributions in Woven Fabric Composite Iosipescu Specimens

Failure assessment of a woven E-glass/vinyl ester composite subjected to large deformation loading

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