Combined tensile e measurement and proof loading of lumber
阅读：512发布：2022-07-03
专利汇可以提供Combined tensile e measurement and proof loading of lumber专利检索，专利查询，专利分析的服务。并且A method and apparatus for stress grading structural wood members in a non-destructive test by which each member is proof loaded in tension parallel to the grain at a stress level approaching the predicted rupture strength of the particular member. The modulus of elasticity of each member is measured at low stress during the early stages of the loading cycle. The proof load level for each member is determined in relation to its measured modulus of elasticity.，下面是Combined tensile e measurement and proof loading of lumber专利的具体信息内容。
1. A method of non-destructive testing of structural wood members, comprising the following steps: measuring the modulus of elasticity of the wood member without physical damage to the wood structure thereof; and subsequently applying to the member a tensile proof load parallel to its wood grain, the proof load being selected so as to approach the predicted load at which rupture would occur in a member of such modulus of elasticity; the step of measuring modulus of elasticity being carried out by monitoring the stress to which the member is subjected at a relatively low stress level and the resulting strain along the member; the increasing application of tensile force being continuous throughout the step of measuring the modulus of elasticity and through the application of the proof load.
1. A method of non-destructive testing of structural wood members, comprising the following steps: measuring the modulus of elasticity of the wood member without physical damage to the wood structure thereof; and subsequently applying to the member a tensile proof load parallel to its wood grain, the proof load being selected so as to approach the predicted load at which rupture would occur in a member of such modulus of elasticity; the step of measuring modulus of elasticity being carried out by monitoring the stress to which the member is subjected at a relatively low stress level and the resulting strain along the member; the increasing application of tensile force being continuous throughout the step of measuring the modulus of elasticity and through the application of the proof load.
2. The method set out in claim 1 further comprising the step of monitoring the rate of strain increase resulting from the load applied to the member; and releasing the applied load in response to non-linear increases in the monitered strain.
3. The method as set out in claim 1 wherein the step of measuring the modulus of elasticity is accomplished incrementally along the length of the member.
4. The method of claim 3 wherein the predicted load at which rupture would occur is correlated to the lowest incremental modulus of elasticity along the length of the member.
5. The method of claim 3 wherein the predicted load at which rupture would occur is correlated to the widest fluctuation in modulus of elasticity between the incremental measurements made along the length of the member.
6. A method of grading structuraL wood members without damage, comprising the following steps: first stressing the member in tension parallel to the grain at a low stress level by application of tensile force to the member; measuring the resulting strain in the member at said low stress level; determining the modulus of elasticity in tension for the member from the relationship of stress to strain; and subsequently applying to the member a proof load in tension parallel to the grain at a high stress level approaching the predicted stress level at which rupture would occur for a member of such modulus of elasticity in tension by increasing the application of tensile force to the member; the increasing application of tensile force being continuous throughout the step of determining the modulus of elasticity and the frequent application of the proof load.
7. The method set out in claim 6 wherein the wood member is subjected to an initial pre-determined tensile stress prior to initiation of strain measurement.
8. The method of claim 6 wherein the modulus of elasticity is calculated for less than the full length of the wood member.
9. The method of claim 6 wherein the modulus of elasticity is calculated incrementally along the length of the wood member.
10. The method of claim 6 wherein the modulus of elasticity is calculated incrementally along the length of the wood member; the proof load being selected to correspond with the lowermost calculated modulus of elasticity of the wood member.
11. The method of claim 6 wherein the modulus of elasticity is calculated incrementally along the length of the wood member; the proof load being selected to correspond with the widest fluctuation in modulus of elasticity between the incremental measurements made along the length of the member.
12. A method of grading structural wood members without damage, comprising the following steps: first developing in the member a pre-determined low tensile strain by application of tensile force to the member; monitoring the resulting stress in the member at said low level of strain; determining the modulus of elasticity in tension for the member from the relationship of strain to stress; and subsequently applying to the member a tensile proof load parallel to the grain at a high stress level approaching the predicted stress level at which rupture would occur for a member of such modulus of elasticity in tension by increasing the application of tensile force to the member; the increasing application of tensile force being continuous throughout the step of determining the modulus of elasticity and the frequent application of the proof load.
13. The method set out in claim 12 wherein the wood member is subjected to an initial pre-determined tensile stress prior to initiation of strain measurement.
14. The method of claim 12 wherein the modulus of elasticity is calculated for less than the full length of the wood member.
15. The method of claim 12 wherein the modulus of elasticity is calculated incrementally along the length of the wood member.
16. The method of claim 12 wherein the modulus of elasticity is calculated incrementally along the length of the wood member; the proof load being selected to correspond with the lowermost calculated modulus of elasticity of the wood member.
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