ASTM D5573 - 99(2012)

    Standard Practice for Classifying Failure Modes in Fiber-Reinforced-Plastic (FRP) Joints

    Active Standard ASTM D5573 | Developed by Subcommittee: D14.40

    Book of Standards Volume: 15.06


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    Significance and Use

    4.1 This practice provides a simple means of classifying failure modes for adhesively bonded FRP joints.

    4.2 Each failure mode classification is based solely on a visual observation of the failure surface without the aid of a microscope or other means to magnify the surface.

    4.3 Except for the line-drawing representations given, this practice does not contain descriptions of failure modes possible when using adhesion promoters. However, similar analogies to the failure modes described herein can be made.

    4.4 This practice does not address the acceptability of any specific failure mode.

    1. Scope

    1.1 This practice covers the method of classifying, identifying, and characterizing the failure modes in adhesively bonded fiber-reinforced-plastic (FRP) joints. The FRP used in developing this practice consists of glass fibers in a thermoset-polyester-resin matrix, commonly referred to as sheet-molding compound, or SMC.

    1.2 One objective of this practice is to present comprehensive definitions of possible failure modes to serve as a guide for contracts, drawings, product specifications, and product performance.

    Note 1Figures 2 through 11 referred to in the practice are contained in the ASTM adjunct, Color Photographs of Failure Modes.2

    Fig. 2—Side-by Side Comparison of Failure Modes

    Fig. 3—Adhesive Failure

    Fig. 4—Cohesive Failure

    Fig. 5—Thin-Layer Cohesive Failure

    Fig. 6—Fiber-Tear Failure

    Fig. 7—Light-Fiber-Tear Failure

    Fig. 8—Stock-Break Failure

    Fig. 9—Mixed Failure—40 % Fiber-Tear Failure, 60 % Light-Fiber-Tear Fiber

    Fig. 10—Mixed Failure—32 % Adhesive Failure, 68 % Fiber-Tear Failure

    Fig. 11—Mixed Failure—20 % Adhesive Failure, 60 % Light-Fiber-Tear Failure, 20 % Fiber-Tear Failure
    Note 2This practice may be used to describe the failure modes generated from testing, using procedures such as Test Methods D3163, D3164, D3165, D3807, D5041, D5868, and SAE J1525.

    1.3 The values stated in SI units are to be regarded as the standard.

    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.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D907 Terminology of Adhesives

    D3163 Test Method for Determining Strength of Adhesively Bonded Rigid Plastic Lap-Shear Joints in Shear by Tension Loading

    D3164 Test Method for Strength Properties of Adhesively Bonded Plastic Lap-Shear Sandwich Joints in Shear by Tension Loading

    D3165 Test Method for Strength Properties of Adhesives in Shear by Tension Loading of Single-Lap-Joint Laminated Assemblies

    D3807 Test Method for Strength Properties of Adhesives in Cleavage Peel by Tension Loading (Engineering Plastics-to-Engineering Plastics)

    D5041 Test Method for Fracture Strength in Cleavage of Adhesives in Bonded Joints

    D5868 Test Method for Lap Shear Adhesion for Fiber Reinforced Plastic (FRP) Bonding

    SAE Standard

    SAEJ1525 SAE Recommended Practice--Lap Shear Test for Automotive-Type Adhesives for Fiber Reinforced Plastic (FRP) Bonding Available from SAE International (SAE), 400 Commonwealth Dr., Warrendale, PA 15096-0001, http://aerospace.sae.org.


    ICS Code

    ICS Number Code 83.120 (Reinforced plastics)

    UNSPSC Code

    UNSPSC Code 81101801(Plastics engineering)


    DOI: 10.1520/D5573-99R12

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