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小木虫论坛-学术科研互动平台 » 专业学科区 » 农林 » 林学 » 木材的应力应变关系是怎样的呀？
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beyond1987

铁虫 (初入文坛)

[求助] 木材的应力应变关系是怎样的呀？ 已有1人参与

大家有知道的么？
我找了各种书籍和文献，都没有看到有讲木材本构关系的。有没有人有这方面的资料或文献什么的么？有的话发给我一份吧，感激不尽~
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1楼 2013-02-05 15:38:21
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yuekong

至尊木虫 (文坛精英)

【答案】应助回帖

跟含水率有关系，总的来说，弯、压，是弹塑性；拉是线弹性

[ 发自手机版 http://muchong.com/3g ]
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6楼2013-08-03 19:41:54
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一条小书虫

铁杆木虫 (知名作家)

【答案】应助回帖

感谢参与，应助指数 +1
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2楼2013-02-06 09:24:16
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ehe333333

木虫 (著名写手)
找到一个别人的实验。自己看看吧。


Materials testing laboratories determine wood strength and stiffness in a standard static-bending test where the test specimen's resistance to slowly applied loads is measured. The standard tests are generally conducted at 12% moisture content and 20° C temperature. The ends of the test specimen are supported on rollers, usually with growth rings horizontal, and a load is applied at the beam centre so that a constant rate of deflection is maintained until the piece fractures. Instruments measure and plots the load (stress) and the deflection (strain) at intervals, as shown in the diagram. The vertical axis reflects the increasing stress and the horizontal axis the increasing strain.

The first part of the curve is a straight line where the deflection is directly proportional to the load and where, once the load is removed, the beam will return to its original state; i.e. it retains its elasticity. With increasing load, a limit point of proportionality is reached after which the increase in amount of deflection is greater than (i.e. no longer proportional with) the increase in load; but elasticity is still retained until an elastic limit is reached. If stress is further increased, the material loses elasticity and becomes plastic (i.e when the load is removed the deformation caused by deflection will be more or less permanent). At the point of maximum load, ultimate load or ultimate strength, the material begins to yield and will fracture unless load is substantially reduced.

stress_strain.gif
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3楼2013-02-08 17:20:17
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手中的沙

金虫 (小有名气)

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《木质资源材料学》 或者各种版本的《木材学》都会有较为详细的介绍的…而且这类文献不是一搜一大把吗…

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4楼2013-02-16 11:56:12
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