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Description of ASTM-D6115 2011ASTM D6115 - 97(2011)Standard Test Method for Mode I Fatigue Delamination Growth Onset of Unidirectional Fiber-Reinforced Polymer Matrix CompositesActive Standard ASTM D6115 | Developed by Subcommittee: D30.06 Book of Standards Volume: 15.03 ASTM D6115Significance and Use Susceptibility to delamination is one of the major weaknesses of many advanced laminated composite structures. Knowledge of a laminated composite materialresistance to interlaminar fracture under fatigue loads is useful for product development and material selection. Furthermore, a measurement of the relationship of the mode I cyclic strain energy release rate and the number of cycles to delamination growth onset, G N , that is independent of specimen geometry or method of load introduction, is useful for establishing design allowables used in damage tolerance analyses of composite structures made from these materials. This test method can serve the following purposes: 5.2.1 To establish quantitatively the effects of fiber surface treatment, local variations in fiber volume fraction, and processing and environmental variables on G N of a particular composite material. 5.2.2 To compare quantitatively the relative values of G N for composite materials with different constituents. 5.2.3 To develop criteria for avoiding the onset of delamination growth under fatigue loading for composite damage tolerance and durability analyses. 1. Scope 1.1 This test method determines the number of cycles ( N ) for the onset of delamination growth based on the opening mode I cyclic strain energy release rate ( G ), using the Double Cantilever Beam (DCB) specimen shown in . This test method applies to constant amplitude, tension-tension fatigue loading of continuous fiber-reinforced composite materials. When this test method is applied to multiple specimens at various G -levels, the results may be shown as a G-N curve, as illustrated in Fig 2. 1.2 This test method is limited to use with composites consisting of unidirectional carbon fiber tape laminates with single-phase polymer matrices. This limited scope reflects the experience gained in round robin testing. This test method may prove useful for other types and classes of composite materials, however, certain interferences have been noted (see Section 6.5 of Test Method D 5528). 1.3 The values stated in SI units are to be regarded as standard. The values provided in parentheses are for information only. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM Standards D883 Terminology Relating to Plastics D2584 Test Method for Ignition Loss of Cured Reinforced Resins D2651 Guide for Preparation of Metal Surfaces for Adhesive Bonding D2734 Test Methods for Void Content of Reinforced Plastics D3171 Test Methods for Constituent Content of Composite Materials D3878 Terminology for Composite Materials D5229/D5229M Test Method for Moisture Absorption Properties and Equilibrium Conditioning of Polymer Matrix Composite Materials D5528 Test Method for Mode I Interlaminar Fracture Toughness of Unidirectional Fiber-Reinforced Polymer Matrix Composites E4 Practices for Force Verification of Testing Machines E6 Terminology Relating to Methods of Mechanical Testing E122 Practice for Calculating Sample Size to Estimate, With Specified Precision, the Average for a Characteristic of a Lot or Process E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods E456 Terminology Relating to Quality and Statistics E467 Practice for Verification of Constant Amplitude Dynamic Forces in an Axial Fatigue Testing System E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method E739 Practice for Statistical Analysis of Linear or Linearized Stress-Life (S-N) and Strain-Life (-N) Fatigue Data E1049 Practices for Cycle Counting in Fatigue Analysis E1150 Definitions of Terms Relating to Fatigue Keywords composite materials; delamination; double cantilever beam; frequency; maximum cyclic stain energy release rate; mode I; onset of fatigue delamination growth; ICS Code ICS Number Code 83.120 (Reinforced plastics) DOI: 10.1520/D6115-97R11 ASTM International is a member of CrossRef. ASTM D6115This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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