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	曲げ破壊強度および弾性率	木の収縮
分野	林学	林学
系統	Process / pipeline	Process / pipeline
提唱年	1950	1950
提唱者	ASTM International	Carl Skaar
種類	mechanical test	moisture response test
原典	ASTM D143-19. (2019). Standard test methods for small clear specimens of timber. ASTM International.	ASTM D143-19. (2019). Standard test methods for small clear specimens of timber. ASTM International.
別名	MOR, MOE, bending strength	dimensional change, anisotropic shrinkage
関連	3	2
概要	The Modulus of Rupture (MOR) and Modulus of Elasticity (MOE) are standardized measures of wood mechanical properties determined through static bending tests. MOR quantifies the maximum bending stress wood can withstand before failure; MOE measures stiffness (resistance to bending). These are fundamental properties used for wood grading, structural design, and assessment of wood quality and species suitability for applications requiring strength or stiffness.	Wood shrinkage is the dimensional change that occurs as wood loses moisture from green (freshly felled) to oven-dry condition. Wood shrinks anisotropically: tangentially (along growth rings) more than radially (from center to edge), and both more than longitudinally (along the grain). Measuring shrinkage percentages is essential for understanding wood drying behavior, predicting checking and warping, and selecting materials for applications sensitive to dimensional change (flooring, cabinetry, musical instruments).