Physical and Mechanical Properties of Eucalyptus Urophylla Clone K62 Wood
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Abstract
Eucalyptus is a raw material frequently used in the timber and fiber industries. However, most of the eucalyptus grown is used in the production of low-value products such as pulp, energy, and wood composites for furniture. Most eucalyptus species are rarely processed into sawn timber. The objective of this research was to study the physical and mechanical properties of Eucalyptus urophylla clone K62 wood for utilization in the form of sawn timber and manufacturing of high-value structural products such as glue laminated timber (GLT) and cross-laminated timber (CLT). Various physical properties of the eucalyptus clone K62 were measured and included average specific gravity at oven-dry condition, which was 0.63. Additionally, the average fiber saturation point was between 23 to 25%, and maximum shrinkages in tangential, radial, and longitudinal directions were 7.5, 5.10, and 0.02%, respectively. The reduction in moisture content from the fiber saturation point to 0% and equilibrium moisture content (EMC) from desorption isotherm indicated that EMC decreased with increasing temperature and at constant temperature, EMC value decreased with decreasing relative humidity. The mechanical properties were tested at an average moisture content of 10.75%, with an average modulus of rupture of 112.08 MPa, modulus of elasticity of 9,213 MPa, compression parallel to grain of 55.93 MPa, compression perpendicular to grain of 9.68 MPa, hardness of 5,875 N, and cleavage and nail holding of 2.25 and 35.34 N/mm respectively. The mechanical properties were compared with wood standard used in structural analysis, and it was found that the strength of eucalyptus clone K62 wood passed the standard and was suitable for the main structure of buildings and manufacturing products for building materials.
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ข้าพเจ้าและผู้เขียนร่วม (ถ้ามี) ขอรับรองว่า ต้นฉบับที่เสนอมานี้ยังไม่เคยได้รับการตีพิมพ์และไม่ได้อยู่ในระหว่างกระบวนการพิจารณาตีพิมพ์ลงในวารสารหรือสิ่งตีพิมพ์อื่นใด ข้าพเจ้าและผู้เขียนร่วม (ถ้ามี) ยอมรับหลักเกณฑ์และเงื่อนไขการพิจารณาต้นฉบับ ทั้งยินยอมให้กองบรรณาธิการมีสิทธิ์พิจารณาและตรวจแก้ต้นฉบับได้ตามที่เห็นสมควร พร้อมนี้ขอมอบลิขสิทธิ์ผลงานที่ได้รับการตีพิมพ์ให้แก่วารสารวนศาสตร์ คณะวนศาสตร์ มหาวิทยาลัยเกษตรศาสตร์ กรณีมีการฟ้องร้องเรื่องการละเมิดลิขสิทธิ์เกี่ยวกับภาพ กราฟ ข้อความส่วนใดส่วนหนึ่ง หรือ ข้อคิดเห็นที่ปรากฏในผลงาน ให้เป็นความรับผิดชอบของข้าพเจ้าและผู้เขียนร่วม (ถ้ามี) แต่เพียงฝ่ายเดียว และหากข้าพเจ้าและผู้เขียนร่วม (ถ้ามี) ประสงค์ถอนบทความในระหว่างกระบวนการพิจารณาของทางวารสาร ข้าพเจ้าและผู้เขียนร่วม (ถ้ามี) ยินดีรับผิดชอบค่าใช้จ่ายทั้งหมดที่เกิดขึ้นในกระบวนการพิจารณาบทความนั้น”
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