1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards THE TEST METHOD OF IMPACT RESISTANCE OF PLASTIC COMPONENTS EDS-T-7503 ISSUED DATE: 1990. 10. 17 REVISED DATE: 2006. 06. 19 VERSION: 3 EDS-T-7503THE TEST METHOD OF IMPACT RESISTANCE OF PLASTIC COMPONENTS PAGE: 1/4 ISSU
2、ED DATE: 1990. 10. 17 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 1. PURPOSE The purpose of this standard is to determine the impact resistance of plastic components by applying the impact to them under specified conditions. This test shall be applied for plastic components whi
3、ch are likely to be subject to impact stresses when equipped with a vehicle. 2. SCOPE This standard shall be applied to the test method for determination of impact resistance of plastic components. 3. TEST PIECES 3.1. The test piece shall be finished parts. If there is no special specification, then
4、 for sample approval at least 3 test pieces shall be tested. And for routine quality control, at least 1 test piece shall be tested. 3.2. Sample of components or material released to this specification shall be tested for conformity with the requirements of this specification and approved by GMDAT T
5、ECHNICAL CENTER prior to comments of delivery of bulk supplies. 3.3. In the event of any intentional deviation for the requirements of this specification it is the sole, responsibility of the supplier to inform the purchaser of all such deviation. Furthermore the supplier shall submit unsolicited sa
6、mples for reapproval by GMDAT TECHNICAL CENTER prior to comments of delivery of bulk supplies. 3.4. Deviation from the requirements of this test method (e.g. test piece conditioning, technical data of test apparatus, time and temperature of test) shall have been agreed upon: Those requirements shall
7、 be specified on component drawings, etc. and shall be defined in test reports, etc. 4. CONDITIONING The test pieces shall be maintained for at least 16 hours at a temperature of 21 to 25and a relative humidity of 44 to 56%. 5. APPARATUS 5.1. Apparatus A - Drop ball type impact testing machine The t
8、esting device which an ball drops from a predetermined height so as to produce the specified impact energy by free falling the ball onto the test piece. 5.2. Apparatus B - Pendulum type impact testing machine A pendulum type impact testing machine which an impact hammer, suspended on a pendulum of s
9、pecified length, drops from a predetermined height so as to produce the specified impact energy on the test piece. EDS-T-7503THE TEST METHOD OF IMPACT RESISTANCE OF PLASTIC COMPONENTS PAGE: 2/4 ISSUED DATE: 1990. 10. 17 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 5.3. Impact Ha
10、mmer The impact hammer shall have the following dimensions: Diameter: (501) mm Radius: (251) mm Mass: (5101) g A metal ball having a weight of 510 g is also permitted as substitute for the hammer. 5.4. Test piece supports Test piece supports shall be provided such that test pieces may be securely fa
11、stened so as to as similarly as possible with real equipped state and to ensure that the impact will strike at right angles to any designated spot on the surface. The supports shall be rigid enough to ensure that the impact force is totally absorbed by the test piece. 5.5. Low temperature chamber It
12、 shall be capable of maintaining down to -40. 6. TESTING CONDITIONS The test may be performed under any of the following test conditions. Such conditions will be stipulated on the relevant drawings, material specifications etc. 6.1. Coding 1: Test at the common temperature (+23) after aging. The agi
13、ng period and the temperature condition shall be indicated respectively as X and Y on the relevant drawings, material specifications. 6.2. Coding 2: Test at a room temperature. 6.3. Coding 3: After maintaining the plastic component for 4 hours at a temperature of -30, test immediately after removal
14、from the chamber. 7. PROCEDURE 7.1. The test piece shall be fastened to the test piece support, and the test piece and the support shall be maintained under the test conditions as specified in clause 6. 7.2. The contact surface shall be at right angles to the direction of movement of the impact hamm
15、er. 7.3. The impact hammer shall be lifted to the position specified and dropped on the test pieces. 7.4. Be sure not to impact on the same test point repeatedly which was impacted once. EDS-T-7503THE TEST METHOD OF IMPACT RESISTANCE OF PLASTIC COMPONENTS PAGE: 3/4 ISSUED DATE: 1990. 10. 17 REVISED
16、DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 8. CALCULATION OF IMPACT ENERGY The impact energy shall be calculated by the following equation depending on the type of the tester A, B. If energy is given in the specification or drawing, calculate the drop height according to this equation
17、 and test. E = impact energy(J) h = drop height(m) m = mass of hammer(kg) = angle of deflection() = length of pendulum(m) 8.1. Apparatus A - Drop ball type impact test E = m g h EDS-T-7503THE TEST METHOD OF IMPACT RESISTANCE OF PLASTIC COMPONENTS PAGE: 4/4 ISSUED DATE: 1990. 10. 17 REVISED DATE: 20
18、06. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 8.2. Apparatus B - Pendulum type impact test E = m g h, h = (1 - COS ) 9. EVALUATION Test pieces shall be examined with the naked eye. After completion of test, the component shall show no breakage or cracks. 10. CODING SYSTEM The requirements for impact resistance shall be specified on drawings or in material specification as follows: Impact resistance test to EDS-T-7503 3A MIN. 5J Requiremnt Test condition Test method Designation 11. REFERENCE GME 60267 Determination of impact resistance of plastic components
