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ASTM D is a test method used to study the compressive properties of a composite laminate that has a hole cut into it. The GD fixture meets the requirements of ASTM D for open-hole compressive strength testing of fiber-reinforced polymer-matrix composite. The ASTM D / DM fixture is used to perform open-hole compressive tests on multi-directional polymer matrix composite laminates reinforced with high .

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The portion of the force initially transferred into the support? Two acceptable test procedures are d644. If the gap is too large, shim between the support plate and the long grip, holding the shim stock on the support plate with tape.

Additional discussion can be found in Reference 9. NOTE 6—The hole diameter is ignored in the strength calculation; the gross cross-sectional area is used. Within the text the inch-pound units are shown in brackets. The specimen, typically, but not necessarily, a quasi-isotropic laminate, is 12″ long, 1. In laminated composites, the principal material coordinate system has meaning only with respect to an individual orthotropic lamina.

ASTM D6484 Open-Hole Compression (OHC) Testing of CFRP

Report the method of sampling. Subsequent Boeing specifications, and the ASTM standard, do not include these cutouts, strain gages not being used. In such cases, the mechanical test environment may need to be modi? Within the text the inch-pound units are shown in brackets. Sources of variation in this lateral pressure include?

If the ultimate strength of the material cannot be reasonably estimated, initial trials should be conducted using standard speeds until the ultimate strength of the material and the compliance of the system are known, and speed of testing can be adjusted. Reduce the compressive force to 7 N [30 lbf], asgm re-zero and balance all instrumentation.


The extensometers shall be essentially free of inertia lag at the speci?

This chamber shall be capable of maintaining the gage section of the test specimen at the required test environment during the mechanical test. Damage caused by hole preparation will affect strength results.

ASTM D Compression Fixture for Fiber Composite Laminates| GD

While the hole causes a stress concentration and reduced net section, it is common aerospace practice to develop notched design allowable strengths based on gross section stress to account for various stress concentrations fastener holes, free edges,? If the specimen is end-loaded, it may be desirable to provide some additional clamping force at the ends of the specimen, to minimize end-brooming.

Summary of Test Method 4. Historical Version s – view previous versions of standard. Combining values from the two c6484 may result in nonconformance with the standard. The platen surfaces shall be parallel within 0. A number in parentheses indicates the year of last reapproval. Each laboratory tested at ambient laboratory conditions a randomly distributed sample of six specimens for each loading type.

However, they can be bene? The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other. Ultimate strength is calculated based on the gross crosssectional area, disregarding the presence of the hole. Factors f6484 should include the? Terminology E and Practice E de?

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 d6448 use.

Ma8 chining tolerances and surface? Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

If the platens are not sufficiently hardened, or simply to protect the platen surfaces, a hardened plate with parallel surfaces can be inserted between each end of the? Retests shall be performed for any specimen on which values are not calculated.


This notation uses the? At high force levels, some asm behavior may be observed due to grip slippage. The average results for each laboratory are listed in Table 2. The following general notes apply to these? Precision and Bias The force is transmitted by shear into the support? The threading of the support adtm is optional. The calculations shown are based upon actual measured sample thickness and width.

Work Item s – proposed revisions of this standard. Volume percent of the constituents may be evaluated by one of the matrix digestion procedures of Test Method Dor, for certain reinforcement materials such as glass and ceramics, f6484 the matrix burn-off technique in accordance with Test Method D Slipping the ends of the fixture into shallow box-like fittings attached to the testing machine is one such option available from Wyoming Test Fixtures, Inc.

The failure is often heavily in? A gap outside of this tolerance range is indicative of either improper assembly, an out-of-tolerance specimen, or damaged? Estimate the coupon strength to aid in transducer selection, calibration of equipment, and determination of equipment settings. Current edition approved Mar. If the fixture is loaded between flat platens, some type of lateral constraint should be provided so that the fixture does not slip out from between the platens while being compression loaded, as a safety precaution.

Store the specimens in the conditioned environment until test time, if the test environment is different than the conditioning environment. Shear loading is preferred in the Boeing specification, but requires relatively large hydraulic grips, i.

Originally approved in