เปรียบเทียบวิธี

	ความแข็งของจันกา	การหดตัวของไม้
สาขาวิชา	วนศาสตร์	วนศาสตร์
ตระกูล	Process / pipeline	Process / pipeline
ปีกำเนิด	1934	1950
ผู้ริเริ่ม	Gabriel Janka	Carl Skaar
ประเภท	hardness test	moisture response test
แหล่งต้นตำรับ	ASTM D1037-21. (2021). Standard test methods for evaluating properties of wood-base fiber and particle panel materials. ASTM International.	ASTM D143-19. (2019). Standard test methods for small clear specimens of timber. ASTM International.
ชื่อเรียกอื่น	wood hardness, resistance to indentation	dimensional change, anisotropic shrinkage
ที่เกี่ยวข้อง	3	2
สรุป	The Janka hardness test measures wood resistance to indentation and denting by forcing a steel ball into the wood surface under standard load. Developed by Gabriel Janka in 1934, the test is a simple, nondestructive indicator of wood durability, wear resistance, and suitability for flooring, furniture, and other wear-prone applications. Janka hardness is one of the most widely used wood property metrics in wood science and commerce.	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).