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 .
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 values stated in each system are not exact equivalents; therefore, each system must be used independently of the other.
Subsequent Boeing specifications, and the ASTM standard, do not include these cutouts, strain gages d64484 being used. The ends of the grip-jaws on wedge-type grips should be even with each other following insertion to 11 avoid inducing a bending moment which could result in premature failure of the specimen. Two types of precision within-laboratory repeatability and between-laboratory reproducibility are reported.
Unless coupon rupture is speci? In Procedure A, the?
Factors that influence the notched compressive strength d6448 shall therefore be reported include the following: The values stated in each system are not exact equivalents; therefore, each system must be used independently of the other.
This laminate has relatively high stiffness with high notch sensitivity and was selected to produce high failure forces in order to evaluate the two loading methods using test laminate parameters representing the upper capability of the test method. Each laboratory tested at ambient laboratory conditions a randomly distributed sample of six specimens for each loading type.
Performance of F-test and t-tests on the pooled data sets for each loading type indicated aetm both tests passed, such that the grip-loading and end-loading data sets were deemed compatible with regard to mean behavior and variance.
Ast symbol 1 For existing? An early version of the Boeing Open-Hole Compression Test Fixture included cutouts to clear strain gages bonded to the surfaces of the specimen, and to provide egress for the gage wiring. If this gap does not meet the minimum requirement, shim the contact area between the support plate and the short grip with stainless steel shim ashm.
NOTE 6—The hole diameter is ignored in the strength calculation; the gross cross-sectional area is used. ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
The void content equations of Test Method D4684 are applicable to both Test Method D and the matrix digestion procedures.
ASTM D6484 Open-Hole Compression (OHC) Testing of CFRP
Use of these symbols is restricted to analytical dimensions when used with square brackets, as the symbols may have other de? The panel must be?
Properties that may be derived from this test method include open-hole notched compressive strength OHC. Thus, data gathered using this test method may not translate directly into equivalent thickstructure properties.
Assembled Fixture without specimen. The fixture supports the test specimen continuously along both faces, a sufficient gap d64884 designed into the astn v-shaped joints in both sides of the fixture see the partially assembled fixture in Fig. Store the specimens in the conditioned environment until test time, if the test environment is different than the conditioning environment.
The Boeing Open-Hole Compression test specimen is shear- or end-loaded in compression to failure in the fixture shown in Figs.
ASTM D6484 Testing Fixture
A detailed comparison of these fixtures is presented in Reference 8. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
Terminology D de?
The following general notes apply to these? Some types of damage, such as longitudinal splitting and delamination, can blunt the stress concentration caused by the hole, increasing the force-carrying capacity of the coupon and the calculated strength.
Fabric laminates 6 containing satin-type weaves shall have symmetric warp surfaces, unless otherwise speci? Hydraulic wedge grips shall apply sufficient lateral pressure to prevent slippage between the grip face and the support? Terminology E 6 de?
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 cutout exists on both faces of the? NOTE 2—Experience has shown that? Results may also be affected by the ratio of ungripped specimen length to specimen width; this ratio should be maintained at 2. Anisotropic materials do not have a principal material coordinate system due to the total lack of symmetry, while, for isotropic materials, any coordinate system is a principal material coordinate system.