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首页> 美国卫生研究院文献>Materials >Strain Measurements within Fibre Boards. Part II: Strain Concentrations at the Crack Tip of MDF Specimens Tested by the Wedge Splitting Method
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Strain Measurements within Fibre Boards. Part II: Strain Concentrations at the Crack Tip of MDF Specimens Tested by the Wedge Splitting Method

机译：纤维板上的应变测量。第二部分：用楔形劈裂法测试的中密度纤维板试样裂纹尖端处的应变浓度

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This is the second part of an article series where the mechanical and fracture mechanical properties of medium density fiberboard (MDF) were studied. While the first part of the series focused on internal bond strength and density profiles, this article discusses the fracture mechanical properties of the core layer. Fracture properties were studied with a wedge splitting setup. The critical stress intensity factors as well as the specific fracture energies were determined. Critical stress intensity factors were calculated from maximum splitting force and two-dimensional isotropic finite elements simulations of the specimen geometry. Size and shape of micro crack zone were measured with electronic laser speckle interferometry. The process zone length was approx. 5 mm. The specific fracture energy was determined to be 45.2 ± 14.4 J/m2 and the critical stress intensity factor was 0.11 ± 0.02 MPa.
机译：这是文章系列的第二部分，其中研究了中密度纤维板（MDF）的力学和断裂力学性能。虽然该系列的第一部分关注内部粘结强度和密度分布，但本文讨论了芯层的断裂力学性能。用楔形劈裂装置研究了断裂特性。确定了临界应力强度因子以及比断裂能。临界应力强度因子是通过最大劈裂力和样品几何形状的二维各向同性有限元模拟计算得出的。用电子激光散斑干涉法测量微裂纹区的大小和形状。加工区的长度约为。 5毫米确定的比断裂能为45.2±14.4J / m 2 ，临界应力强度因子为0.11±0.02MPa。

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