Modeling stress relaxation response of wheat en masse using the triaxial test

R. G. Bock, V. M. Puri, H. B. Manbeck

Research output: Contribution to journalArticlepeer-review

10 Scopus citations


Time dependent load response data were obtained from triaxial tests to characterize the stress relaxation behavior of wheat en masse. Stress relaxation data were measured for two axial strains, two confining pressures, two moisture contents, and two initial bulk densities. The generalized Maxwell model was used to simulate the stress relaxation response of wheat. The test data were transformed into dimensionless quantities using initial or maximum elastic modulus Emax and half relaxation time T50. The data converged for t < T50 using dimensionless modulus φ = E/Emax as dependent variable and dimensionless time θ = t/T50 as independent variable. Two boundary condition variables - confining pressure and axial strain, significantly affected the initial elastic modulus; whereas, three variables - confining pressure, initial bulk density and moisture content, significantly affected the half relaxation time.

Original languageEnglish (US)
Pages (from-to)1701-1708
Number of pages8
JournalTransactions of the American Society of Agricultural Engineers
Issue number5
StatePublished - Sep 1 1989

All Science Journal Classification (ASJC) codes

  • Agricultural and Biological Sciences (miscellaneous)


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