Parallel Network Modeling of the Tensile Response of Dyneema SK76 Single Fiber
Abstract
In this study, experimental uniaxial tensile experiments on Dyneema SK76 single ultra-high molecular weight polyethylene fibers were conducted at strain rates of 0.001/s, 1/s, and 1,000/s. In addition, tensile stress-relaxation and frequency responses from 0 to 170 Hz were also obtained for Dyneema SK76 single fibers. With experimentally measured rate-dependent and stress-relaxation responses, model parameters of two network-based constitutive models were obtained. Although a parallel-networked, second-order time-independent hyperelastic Ogden element with six viscoelastic flow elements was able to capture the rate dependency of Dyneema SK76, the deformation under stress-relaxation behavior was not well represented. The Bergstrom-Boyce (BB) model, which combines time-independent eight-chain Arruda-Boyce elements with BB viscoplastic flow, best described both the rate dependence of the stress-strain responses as well as the nonlinear plastic stress-relaxation deformation behavior at the limiting lower strain rates. Predicted storage and loss moduli frequency responses from both parallel networks were also compared with the measured responses. Although neither model satisfactorily predicted the experimental response, the BB model responses were closer to the experiment, with less error and similar dependency on frequency.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 2024
- Accession Number
- AD1221856
Entities
People
- Brett Sanborn
- Tusit Weerasooriya
Organizations
- United States Army Research Laboratory