Dorfmann A Luis, Woods William A, Trimmer Barry A
Department of Civil and Environmental Engineering, Tufts University, Medford, MA 02155, USA.
J R Soc Interface. 2008 Mar 6;5(20):349-62. doi: 10.1098/rsif.2007.1076.
Experimental data on the passive mechanical properties of the ventral interior lateral muscle of the tobacco hornworm caterpillar, Manduca sexta, are reported. The stress-deformation response of the Manduca muscle is shown to be nonlinear pseudo-elastic, capable of large deformations and subject to stress softening during initial loading cycles. The muscle passive mechanical properties also depend on multiple time-dependent processes. In particular, we show new experimental data from cyclic loading tests of an unstimulated muscle with constant maximum stretch and different, constant engineering strain rates. Then, on the basis of these data a constitutive model is derived to reproduce the main characteristics of this behaviour. In formulating the constitutive model, we consider the muscle as a complex macromolecular structure with fibrous components at numerous size scales. The model uses a phenomenological approach to account for different mechanisms by which passive force changes during applied deformation and how the muscle properties recover after unloading.
本文报告了烟草天蛾幼虫腹内外侧肌肉被动力学特性的实验数据。烟草天蛾肌肉的应力-变形响应表现为非线性伪弹性，能够承受大变形，并在初始加载循环中出现应力软化现象。肌肉的被动力学特性还取决于多个随时间变化的过程。具体而言，我们展示了在恒定最大拉伸和不同恒定工程应变率下，对未受刺激肌肉进行循环加载测试的新实验数据。然后，基于这些数据推导了一个本构模型，以再现这种行为的主要特征。在构建本构模型时，我们将肌肉视为具有多个尺寸尺度纤维成分的复杂大分子结构。该模型采用唯象学方法，以解释在施加变形过程中被动力变化的不同机制，以及卸载后肌肉特性如何恢复。
