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首页> 外文期刊>Journal of Plant Studies >Stress, Strain-Rate Analysis of Sub-Surface Driveway Plants
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Stress, Strain-Rate Analysis of Sub-Surface Driveway Plants

机译：地下路面植物的应力，应变率分析

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Sub-surface driveway plants are strong enough to penetrate a macadam surface of thickness 7 – 9 cm. The mechanics of how the Taraxacum officinale accomplishes this feat remain a mystery. Using the Maxwell model for pavement yielding over time, data are presented which may shed some light on this phenomenon. The post-buckling behavior of the plant stalk is quantified. Euler bending and buckling theory enables calculation of the cellular stress field, compared to turgor pressure, indicating impending cell buckling. Post-buckling plastic strain of the plant stem is 19%. At the cell wall, the stress concentration factor is 3-times greater than the applied external field, so the cell’s internal turgor pressure is overwhelmed by imposed external stress. An Impulse Integral is developed for the surface whereby the product of applied FORCE times TIME is CONSTANT, in order to produce a given amount of surface deflection. Taraxacum officinale stems and leaf stalks are strong enough, in buckling mode, to lift and push apart the fractured macadam crater through which they erupt, but not strong enough to initially crack the surface. The purpose of this work is to determine the mechanisms underlying this unusual plant survival phenomenon, backed by quantified data.
机译：地下车道的植物足够坚固，可以穿透厚度为7 – 9厘米的碎石路面。蒲公英如何完成这项壮举的机制仍然是个谜。使用麦克斯韦（Maxwell）模型随时间推移产生的路面屈服，可以提供数据，该数据可能有助于阐明这种现象。植物茎的屈曲后行为被量化。欧拉弯曲和屈曲理论使得能够计算与应力相比的细胞应力场，表明即将发生的细胞屈曲。植物茎屈曲后的塑性应变为19％。在细胞壁处，应力集中系数是施加的外部电场的3倍，因此细胞的内部膨胀压力会因施加的外部应力而无法承受。为表面开发了一个脉冲积分，从而使施加的力乘以时间乘积为常数，以便产生给定量的表面挠度。蒲公英的茎和叶茎在屈曲模式下足够坚固，可以提起并推开它们破裂的碎碎的碎石火山口，但强度不足以最初使表面破裂。这项工作的目的是在定量数据的支持下，确定这种异常植物存活现象的潜在机制。

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