Experimental Testing of Bend-Twist Coupled Composite Shafts

Rohde, Sean; Ifju, Peter; Sankar, Bhavani V.; Jenkins, David

doi:10.1007/s11340-015-0050-0

Cited by 9 publications

(8 citation statements)

References 11 publications

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“…However, this trend tends to converge with increasing deformation, so that the material behavior approximates more closely to the 30 • /60 • composite, which is visible in Figure 5a. In this context and contributed to the conducted pre-simulations this mixed configuration has an intermediate position regarding the predicted twist versus torque load-coupling behavior [23,41]. Moreover, the results show that the stiffness differs, especially at small strain ratios from 0% up to about 10% deformation.…”

Section: Tension-twist Coupled Effectmentioning

confidence: 86%

“…In general, flexible composites or so-called smart materials, are designed by combining the characteristics of anisotropic materials with soft morphing structures [37,41]. By exploiting these structure-properties, the interaction of different components is indispensable considering the rigid fibers as anisotropic reinforcement, the soft matrix and the mandatory trigger e.g., mechanical or pneumatical initiated as an external stimulus.…”

Section: Theoretical Background For Load Coupled Structures and Desigmentioning

confidence: 99%

“…This behavior may lead to a local fiber-matrix debonding at micro scale without resulting into a complete failure or premature composite breakage induced by delamination like for thermoset-based composites [38][39][40]. Recent studies on soft morphing structures with anisotropic properties using bend-twist or bend-extension coupling described the need of a modified formulation of the CLT, as stiffness and strength of fibers and elastomers differ significantly [34,37,41]. Subsequently, the right choice of the test device with a corresponding setup is crucial to determine exact material properties of highly flexible composites.…”

Section: Introductionmentioning

confidence: 99%

“…Most of the existing measurement devices for fiber reinforced composites are limited to thermoset-based matrices, which cannot fulfill the required test conductions due to local stress concentrations, slippage or pre-damages by inappropriate clamps [38,42]. These test methods related to thermoset-based composites and their load-coupled properties assume that clamping induced compressive stresses can be neglected [41,43]. In this context, additional tabs with a certain tab taper angle are typically considered for a better load transfer and uniform deformation distribution during the test.…”

Section: Introductionmentioning

confidence: 99%

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The Tension-Twist Coupling Mechanism in Flexible Composites: A Systematic Study Based on Tailored Laminate Structures Using a Novel Test Device

et al. 2020

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The focus of this research is to quantify the effect of load-coupling mechanisms in anisotropic composites with distinct flexibility. In this context, the study aims to realize a novel testing device to investigate tension-twist coupling effects. This test setup includes a modified gripping system to handle composites with stiff fibers but hyperelastic elastomeric matrices. The verification was done with a special test plan considering a glass textile as reinforcing with different lay-ups to analyze the number of layers and the influence of various fiber orientations onto the load-coupled properties. The results demonstrated that the tension-twist coupling effect strongly depends on both the fiber orientation and the considered reinforcing structure. This enables twisting angles up to 25° with corresponding torque of about 82.3 Nmm, which is even achievable for small lay-ups with 30°/60° oriented composites with distinct asymmetric deformation. For lay-ups with ±45° oriented composites revealing a symmetric deformation lead, as expected, no tension-twist coupling effect was seen. Overall, these findings reveal that the described novel test device provides the basis for an adequate and reliable determination of the load-coupled material properties between stiff fibers and hyperelastic matrices.

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Section: Tension-twist Coupled Effectmentioning

confidence: 86%

Section: Theoretical Background For Load Coupled Structures and Desigmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The Tension-Twist Coupling Mechanism in Flexible Composites: A Systematic Study Based on Tailored Laminate Structures Using a Novel Test Device

et al. 2020

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“…Recently Rohde et al [6] has proposed a novel composite tube design which yields prescribed bend-twist coupling. The design is described in detail in the Results and Discussions section.…”

Section: Introductionmentioning

confidence: 99%