ASTM D/DM: Standard Test Method for Measuring the Damage Resistance of a Fiber-Reinforced Polymer Matrix Composite to a Drop-Weight Impact. Based on the impact portion of Boeing BSS Type II, Class 2, ASTM D/ DM, covers measuring the damage resistance of fiber reinforced. Designation: D/DM – 12Standard Test Method for Measuring the Damage Resistance of a Fiber-Reinforced Polymer Matrix.
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ASTM D7136/D7136M-05 Measuring Damage Resistance of Composite to Impact Event
Historical Version s – view previous versions of standard. Knowledge of the damage resistance properties of a laminated composite plate is useful for product development and material selection.
The damage response parameters can include dent depth, damage dimensions, and through-thickness locations, F 1F maxE 1 and E maxas well as the force versus time curve.
However, it must be understood that the damage resistance of a composite structure is highly dependent upon several factors including geometry, thickness, stiffness, mass, support conditions, and so forth.
For example, properties obtained using this test method would more likely reflect the damage resistance characteristics of an unstiffened monolithic skin or web than that of a skin attached to substructure which resists out-of-plane deformation.
Similarly, test specimen properties would be expected to be similar to those of a panel with equivalent length and width dimensions, in comparison to those of a panel significantly larger than the test specimen, which tends to divert a greater proportion of the impact energy into elastic deformation.
Historically, for the standard laminate configuration and impact energy, this impactor geometry has generated a larger amount of internal damage for a given amount of external damage, when compared with that observed for similar impacts using sharp striker tips.
Alternative impactors may be appropriate depending upon the damage resistance characteristics being examined. For example, the use of sharp striker tip geometries may be appropriate for certain damage visibility and penetration resistance assessments. In this case, the testing organization should subject several specimens, or a large panel, to multiple low velocity impacts at various impact energy levels using this test method.
A relationship between impact energy and the desired damage parameter can then be developed. Subsequent drop weight impact and compressive residual strength tests can then be performed using specimens impacted at an interpolated energy level that is expected to produce the desired damage state.
ASTM D/DM Measuring Damage Resistance of Composite to Impact Event – Instron
The composite material forms are limited to continuous-fiber reinforced polymer matrix composites, with the range of acceptable test laminates and thicknesses defined in 8. The potential energy of the drop-weight, as defined by the mass and drop height d136 the impactor, is specified prior to test.
Equipment and procedures are provided for optional measurement of contact force and velocity during the impact event. C7136 damage resistance is quantified in terms of the resulting size and type of damage in the specimen.
J Drop Impact Test Machine For Composite Materials Testing ASTM D
Thus, results are generally not scalable to other configurations, and are particular to the combination of geometric and physical conditions tested. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard. It sstm the responsibility of the awtm of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
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