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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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, by the matrix burn-off technique in accordance with Test Method D The fixture supports the test specimen continuously along both faces, a sufficient gap being designed into the staggered v-shaped joints in both sides of the fixture see the partially assembled fixture in Fig.
ASTM D Reference 5in the revision, added four holes in each end of the fixture for clamping bolts, as shown in Fig 4. Sources of Additional Information: A rectangle should be 4 FIG. Guide plates are provided on each side of the fixture to maintain alignment of the assembly. Within the text the inch-pound units are shown in brackets.
Current edition approved Mar. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. The void content equations of Test Method D are applicable to both Test Method D and the matrix digestion procedures. Historical Version s – view previous versions of standard.
Take precautions when cutting specimens from plates to avoid notches, undercuts, rough or uneven surfaces, or delaminations due to inappropriate machining methods.
astj The torque level may be increased above this level when acceptable failure modes cannot be achieved using 7 N-m [60 in-lbf] applied torque. A detailed comparison of these fixtures is presented in Reference 8. Tolerances may be applied to a nominal value to de? The specimen, typically, but not necessarily, a quasi-isotropic laminate, is 12″ long, 1.
ASTM D Open-Hole Compressive Strength of Polymer Matrix Composite Laminates_图文_百度文库
Properties that may be derived from this test method include open-hole notched compressive strength OHC. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. The velocity of the movable head shall be capable of being regulated in accordance with Tighten the four bolts just enough to hold the specimen in place during? Sampling and Test Specimens 8. A Standard 12″ Long by 1.
NOTE 6—The hole diameter is ignored in the strength calculation; the gross cross-sectional area is used. Record the dimensions to three signi?
ASTM D6484 Testing Fixture
Estimate the coupon strength to aid in transducer selection, calibration of equipment, and determination of equipment settings. The calculations shown are based upon actual v6484 sample thickness and width. Link to Active This link will always route to the current Active version of the standard. Atsm 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.
Combining values from the two systems may result in nonconformance with the standard. In such cases, the mechanical test environment may need to be modi? Two types of precision within-laboratory repeatability and between-laboratory reproducibility are reported.
This should result in the specimen hole being centered in the?
aatm This notation uses the? Work Item s – proposed revisions of this standard. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
Within the text the inch-pound units are shown in brackets. 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? The threading of the support plate is optional.
Standard test specimens are 36 by mm [1. This may result in non-conservative data. The range of acceptable test laminates and thicknesses are described in 8.
One of the reference coordinate system axes normally the Cartesian x-axis is designated the reference axis, assigned a position, and the ply principal axis of each ply in the laminate is axtm relative to the reference axis to de? Assembled Fixture without specimen.