ASTM D7249/D7249M-12由美国材料与试验协会 US-ASTM 发布于 2012。
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ASTM D7249/D7249M-12 用长梁弯曲法测定夹层结构贴面性能的标准试验方法的最新版本是哪一版？
最新版本是 ASTM D7249/D7249M-20 。
5. Significance and UseTop Bottom
5.1 Flexure tests on flat sandwich construction may be conducted to determine the sandwich flexural stiffness, the core shear strength, and shear modulus, or the facings??? compressive and tensile strengths. Tests to evaluate core shear strength may also be used to evaluate core-to-facing bonds.
5.2 This test method is limited to obtaining the strength and stiffness of the sandwich panel facings, and to obtaining load-deflection data for use in calculating sandwich beam flexural and shear stiffness using Standard Practice D7250/D7250M. Due to the curvature of the flexural test specimen when loaded, facesheet compression strength from this test may not be equivalent to the facesheet compression strength of sandwich structures subjected to pure edgewise (in-plane) compression.
5.3 Core shear strength and shear modulus are best determined in accordance with Test Method C273 provided bare core material is available. Test Method C393 may also be used to determine core shear strength. Standard Practice D7250/D7250M may be used to calculate the flexural and shear stiffness of sandwich beams.
5.4 This test method can be used to produce facing strength data for structural design allowables, material specifications, and research and development applications; it may also be used as a quality control test for bonded sandwich panels.
5.5 Factors that influence the facing strength and shall therefore be reported include the following: facing material, core material, adhesive material, methods of material fabrication, facing stacking sequence and overall thickness, core geometry (cell size), core density, adhesive thickness, specimen geometry, specimen preparation, specimen conditioning, environment of testing, specimen alignment, loading procedure, speed of testing, facing void content, adhesive void content, and facing volume percent reinforcement. Further, facing strength may be different between precured/bonded and co-cured facesheets of the same material.
Note 2???Concentrated forces on beams with thin facings and low density cores can produce results that are difficult to interpret, especially close to the failure point. Wider loading blocks and rubber pressure pads may assist in distributing the forces.Note 3???To ensure that simple sandwich beam theory is valid, a good rule of thumb for the four-point bending test is the span length divided by the sandwich thickness should be greater than 20 (L/d gt; 20) with the ratio of facing thickness to core thickness less than 0.1 (t/c lt; ..........03Q&ATB/T 3139-2021中车内用非金属材料有害物质限量包括哪些材料？1）板材类材料。包含但不限于高压装饰板（贴面板）、贴面胶合板、胶合板、夹层结构类材料、纤维增强类材料、发泡类结构材料、工程塑料等。2）铺地材料。包含地板布及高分子材料地板（如防腐地板等）。3）胶粘剂。分为溶剂型胶粘剂、水基型胶粘剂、本体胶粘剂。4）涂料。分为溶剂型涂料、水性涂料、水性阻尼涂料。5）橡塑制品。...
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