E. Lara-Curaio, M.G. Jenkins/Composites: Part A 30 (1999)561-567 120 a (b (c) (d Fig. 2. Examples of tensile specimen geometries recommended in ASTM C1275:(a-c) face-loaded specimens;(d) shoulder-loaded specimen. Typical during the test to key material properties (e.g, tensile Tensile Strength and Youngs Modulus for High-Modulus strength, work of fracture)through a simple analysis. As a Single-Filament Materials) was transferred from ASTM result, equations that were derived for linear elastic, isotro- committee D30 to subcommittee C28.07. This coincided pic, homogeneous materials that exhibit symmetric beha- with ongoing efforts of a task group in C28.07 to develop vior in tension and compression, and that have been a standard test method to determine the tensile properties of customarily used to calculate the so-called flexural ceramic fibers both at room and elevated temperatures strength' of CFCCs, are not applicable for these materials. Although there are still issues pending resolution (e.g In spite of this, flexural testing has been and remains a fiber diameter measurements), it is expected that a revision popular test method in industrial laboratories because of of D3379 will include much of the work developed by task its simplicity and because it requires relatively small group C28.0707. samples. As a result of the interest expressed by industry Other documents deal ing with the thermomechanical to continue using this method, standard test method C1341 havior of CFCCs, the strength of CFCC-CFCC joints (Standard Test Method for Flexural Properties of Continu- the tensile transverse strength of CFCCs, the determination ous Fiber-Reinforced Advanced Ceramics) was developed of CFCC fiber-matrix interfacial properties and the hoop and approved in 1996. The scope of C1341 is limited to the strength of CFCC tubular components are currently in draft of flexural data' for quality control and material devel- form or undergoing the AsTM balloting process, and it is opment and, in contrast to flexural data for monolithic cera- expected that these will become AsTM standards in the near mics, the use of CFCC flexure data for design purposes is future 2.5. Round robin 2.4. Other The ASTM requires that standard test methods include Recently, the jurisdiction of D3379(Test Method for recision and bias statements. because of the lack ofduring the test to key material properties (e.g., tensile strength, work of fracture) through a simple analysis. As a result, equations that were derived for linear elastic, isotro￾pic, homogeneous materials that exhibit symmetric beha￾vior in tension and compression, and that have been customarily used to calculate the so-called ‘flexural strength’ of CFCCs, are not applicable for these materials. In spite of this, flexural testing has been and remains a popular test method in industrial laboratories because of its simplicity and because it requires relatively small samples. As a result of the interest expressed by industry to continue using this method, standard test method C1341 (Standard Test Method for Flexural Properties of Continu￾ous Fiber-Reinforced Advanced Ceramics) was developed and approved in 1996. The scope of C1341 is limited to the use of ‘flexural data’ for quality control and material devel￾opment and, in contrast to flexural data for monolithic cera￾mics, the use of CFCC flexure data for design purposes is discouraged. 2.4. Other Recently, the jurisdiction of D3379 (Test Method for Tensile Strength and Young’s Modulus for High-Modulus Single-Filament Materials) was transferred from ASTM committee D30 to subcommittee C28.07. This coincided with ongoing efforts of a task group in C28.07 to develop a standard test method to determine the tensile properties of ceramic fibers both at room and elevated temperatures. Although there are still issues pending resolution (e.g., fiber diameter measurements), it is expected that a revision of D3379 will include much of the work developed by task group C28.07.07. Other documents dealing with the thermomechanical behavior of CFCCs, the strength of CFCC–CFCC joints, the tensile transverse strength of CFCCs, the determination of CFCC fiber–matrix interfacial properties and the hoop strength of CFCC tubular components are currently in draft form or undergoing the ASTM balloting process, and it is expected that these will become ASTM standards in the near future. 2.5. Round robin The ASTM requires that standard test methods include precision and bias statements. Because of the lack of 564 E. Lara-Curzio, M.G. Jenkins / Composites: Part A 30 (1999) 561–567 Fig. 2. Examples of tensile specimen geometries recommended in ASTM C1275: (a–c) face-loaded specimens; (d) shoulder-loaded specimen. Typical dimensions in mm