Abstract Fresh strawberry fruit is highly susceptible to damage during mechanical handlings. To prevent fruit macro-damage from external forces and predict damage evolution in internal tissues, the textural failure mechanics of strawberry fruit and its tissues were characterized by loading-unloading tests at different compression speeds. Strawberry fruit showed expected three stages of deformation during the loading phase, namely elastic, local plastic and structural failure deformation. Their cut-off points depended on the compression speed and loading direction, which was validated further by the corresponding visible browning processes in tissues from fruit longitudinal equatorial section. The peak force and absorbed energy depended on the loading direction and compression speed while the percentage of damaged mass only depended on the loading direction. The fruit was most susceptible to mechanical damage when it was compressed along its stem-blossom axis at low percentage deformation and along its radial axis at high percentage deformation. The absorbed energy and percentage of damaged mass of the strawberry fruit was correlated, which suggested that the absorbed energy could be an appropriate and easily measurable mechanical parameter for quantitatively assessing the degree of fruit damage. The failure stress, failure energy and elastic modulus of fruit tissues increased with the compression speed, while this factor did not affect the failure strain. The average failure stress, failure strain, failure energy and elastic modulus of fruit inner tissue were 0.093 MPa, 17.7%, 8.09 mJ, 0.53 MPa, which was 1.27, 1.14, 1.47, 1.15 times enhanced compared to values of outer tissue (p

中文翻译：

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草莓果实质构破坏力学表征

摘要 新鲜草莓果实在机械处理过程中极易受到损坏。为了防止外力对果实造成宏观损伤并预测内部组织的损伤演变，草莓果实及其组织的质地破坏力学通过不同压缩速度下的加载-卸载测试进行表征。草莓果实在加载阶段表现出预期的三个变形阶段，即弹性变形、局部塑性变形和结构破坏变形。它们的截止点取决于压缩速度和加载方向，这通过水果纵向赤道截面组织中相应的可见褐变过程进一步验证。峰值力和吸收能量取决于加载方向和压缩速度，而损坏质量的百分比仅取决于加载方向。当果实在低变形率下沿茎-花轴压缩时，在高变形率下沿径向轴压缩时，果实最容易受到机械损伤。草莓果实的吸收能量与损伤质量百分比相关，这表明吸收能量可以作为定量评估果实损伤程度的合适且易于测量的力学参数。果实组织的破坏应力、破坏能和弹性模量随着压缩速度的增加而增加，而该因素对破坏应变没有影响。平均破坏应力、破坏应变、