CAJ | 학술논문

为比较不同无损检测方法检测、评估意杨木材弹性模量的可行性和可靠性，分别采用应力波法、自由梁振动法和静态四点弯曲法实测一批苏北意杨锯材的弹性模量值，比较研究了3种方法下的意杨锯材弹性模量值的变异系数、准确指数及相关性。结果表明：3种方法测算的锯材弹性模量值间显著相关，相关系数均大于0．8，且三者中应力波法检测锯材的动态弹性模量值的变异系数和准确指数最小，依据原木应力波弹性模量对锯材进行分等，得到Ⅰ级品率为26．2％，Ⅱ级品率为56．9％，Ⅲ级品率为16．9％。可见，应力波法能够用于检测锯材弹性模量，并作为评定木材性质、预测其力学性能的方法，为中国木材行业锯材产品的最佳质量分等提供理论借鉴。
위비교불동무손검측방법검측、평고의양목재탄성모량적가행성화가고성，분별채용응력파법、자유량진동법화정태사점만곡법실측일비소북의양거재적탄성모량치，비교연구료3충방법하적의양거재탄성모량치적변이계수、준학지수급상관성。결과표명：3충방법측산적거재탄성모량치간현저상관，상관계수균대우0．8，차삼자중응력파법검측거재적동태탄성모량치적변이계수화준학지수최소，의거원목응력파탄성모량대거재진행분등，득도Ⅰ급품솔위26．2％，Ⅱ급품솔위56．9％，Ⅲ급품솔위16．9％。가견，응력파법능구용우검측거재탄성모량，병작위평정목재성질、예측기역학성능적방법，위중국목재행업거재산품적최가질량분등제공이론차감。
The two typical methods such as free beam vibration method and static three-point bending method in the paper were employed to verify the feasibility and reliability of the stress wave method for testing and evaluating the modulus of elasticity of Populus euramericana wood by measuring the modulus of elasticity values of a batch of P.euramericana lumbers.The confidence level, the accurate index and their correlation in three ways were studied comparatively and experimentally.The results showed that the modulus of elasticity values measured by the three methods had high correlations, the correlation coefficients were all greater than 0.8.And the confidence level and accurate index of dynamic modulus of elasticity measured by stress wave were the lowest.Then lumber grading was conducted based on the modulus of elasticity values obtained from stress wave tests, and it was proved that the percentage of GradeⅠproduct quality was 26.2%, GradeⅡproduct quality was 56.9%, and GradeⅢproduct quality was 16.9%, respectively.Hence, stress wave method can be used to measure the modulus of elasticity of sawn timber, and regarded as one of the methods for evaluating the quality and predicting mechanics behaviors of the wood.