Plant tissues are often heterogeneous. To accurately investigate these tissues, methods to spatially map these tissue stiffness values onto finite element models are required. The aim was to study the feasibility of using specimen-specific computed tomography data to inform the spatial mapping of Young's modulus values on finite element models. Specimen-specific finite element models with mapped elastic moduli values were developed. The validation models predicted the structural response of the specimen tests within 11.0% of the physical test data. The ability of the models to accurately predict the force-displacement response of the specimen in a different test configuration was considered to be positive validation of the mapping approach. The existence of a model with accurate spatial distribution of material stiffnesses allows for investigations into the stress patterns within the rind and pith tissues. Typically, structural failure in transverse compression manifests as a crack that propagates in the pith along the line of load. In building detailed FEM analyses, we are able to investigate in more detail how the stress is distributed through the pith, and further investigate the causes of the stress concentrations that ultimately lead to the structural failure of the specimen. A method was developed for determining the relationship between computed-tomography intensity and the transverse elastic modulus in maize stalks. The mapping was used to accurately predict the response of each specimen thus indicating that the mapping relationship is appropriate for modelling and stress analysis activities.

中文翻译：

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使用计算机断层扫描在植物组织的有限元模型中绘制空间分布的材料特性

植物组织通常是异质的。为了准确地研究这些组织，需要将这些组织刚度值空间映射到有限元模型上的方法。目的是研究使用特定于标本的计算机断层扫描数据为有限元模型上杨氏模量值的空间映射提供信息的可行性。开发了具有映射弹性模量值的特定于试样的有限元模型。验证模型在物理测试数据的 11.0% 内预测了样本测试的结构响应。模型准确预测试样在不同测试配置中的力-位移响应的能力被认为是对映射方法的积极验证。具有精确的材料刚度空间分布的模型的存在允许研究外皮和髓组织内的应力模式。通常，横向压缩中的结构破坏表现为裂纹沿载荷线在髓内传播。在构建详细的 FEM 分析时，我们能够更详细地研究应力如何通过髓部分布，并进一步研究应力集中的原因，最终导致试样结构失效。开发了一种用于确定计算机断层扫描强度与玉米秸秆横向弹性模量之间关系的方法。