1、GM DAEWOO Auto & Technology EDS Engineering, GM DAEWOO Auto & Technology Standards THE TEST METHOD FOR INDENTATION HARDNESS OF PLASTICS EDS-T-7515 ISSUED DATE: 1994. 08. 31 REVISED DATE: 2006. 06. 19 VERSION: 3 EDS-T-7515THE TEST METHOD FOR INDENTATION HARDNESS OF PLASTICS PAGE: 1/4 ISSUED DATE: 199
2、4. 08. 31 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 1. SCOPE This test method applies to determining the indentation hardness of plastics and also to testing hard rubbers. 2. DEFINITION 2.1. Indentation hardness: The index between the test load and penetration area when apply
3、ing the test load to the plastic test piece for a given time by using a spherical penetrator of a specified size. 3. TEST PIECES AND NUMBER OF TEST PIECES 3.1. Test pieces shall have plane surfaces with the upper and lower machined parallel, and the each side shall be at least 20 mm and the thicknes
4、s shall be (40.5) mm. 3.2. For initial sample approval and arbitration, at least 5 test pieces shall be tested. And for routine quality control, at least 3 test pieces shall be used. In both cases, the test shall be conducted three times per one test piece. 4. CONDITIONING Perform conditioning accor
5、ding to the requirements specified in the drawing or material standard. Unless otherwise specified, conduct the test under the condition of 232K in temperature and (505)% in relative humidity for at least 16 hrs. 5. APPARATUS 5.1. Hardness tester (see Fig. 1) The one which can measure linear deforma
6、tion by penetration up to 0.01 mm and incase of penetration deformation up to 0.4 mm, and apply an initial load of 9.81 N and other test loads of 49.0, 132, 358 and 961 N within a tolerance of 1%. Fig.1. Penetration hardness tester EDS-T-7515THE TEST METHOD FOR INDENTATION HARDNESS OF PLASTICS PAGE:
7、 2/4 ISSUED DATE: 1994. 08. 31 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 5.2. Penetrator The one which employs a hard and polished steel ball having a diameter of 5 mm (vickers hardness = 800 HV) and shows no deformation nor damage after test. 5.3. Stopwatch 6. PROCEDURE Cond
8、uct test under the condition of +232K in temperature and (505)% in relative humidity. 6.1. Put the test piece on the table of the penetration measuring device in the perpendicular direction to the load applied and gradually apply the initial load to the test piece and after 5 seconds set the penetra
9、tion indicator to the zero point. 6.2. Right after calibration, apply a test load uniformly within 2 seconds. As for the test load, it shall be selected among the test loads in 5.1, which generate linear deformation by penetration within the range of 0.150.35 mm. 6.3. Record the distance of penetrat
10、ion indicated by the penetration indicator after 30 seconds to the nearest 0.01 mm. In case of measuring of the distance of penetration after 10 or 60 seconds, it shall be agreed upon before the test. 6.4. The test shall be carried out three times per one test piece 5 mm apart from the edges of the
11、test piece and the tested area. 7. EVALUATION 7.1. Penetration hardness is H = ESISFr = IIS&+ Where, Fr = Reduced test load (N) d = Diameter of the ball of the penetrator (mm) h = Penetration distance (mm) hr = Reduced penetration distance 0.25 mm) 7.2. Calculate penetration hardness with measured p
12、enetration distance based on the conversion table, Table 1. 8. EXPRESSION OF RESULTS Measured penetration hardness shall be taken from the arithmetical mean value of each test result and presented in N/mm2and to the nearest 0.1 N/mm2. EDS-T-7515THE TEST METHOD FOR INDENTATION HARDNESS OF PLASTICS PA
13、GE: 3/4 ISSUED DATE: 1994. 08. 31 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology 9. CODING SYSTEM Indentation hardness shall be indicated on the drawing or material standard as follows. Indentation hardness to EDS-T-7515 - H132/30 - min 50N Requirements Test condition Test method
14、Test items 10. DEVIATIONS Deviations from the above conditions (for example, test load, loading time) shall be agreed upon and specified on the drawing or material standard and also in the test certificates or reports etc. EDS-T-7515THE TEST METHOD FOR INDENTATION HARDNESS OF PLASTICS PAGE: 4/4 ISSU
15、ED DATE: 1994. 08. 31 REVISED DATE: 2006. 06. 19 VERSION: 3 GM DAEWOO Auto & Technology Table 1. Conversion table of penetration hardness based on the penetration distance Ball Indentation Hardness In N/ for Penetration, h (mm) F = 49.03 N F = 132.29 N F = 357.9 N F = 961.0 N 0.150 0.155 0.160 0.165
16、 0.170 0.175 0.180 0.185 0.190 0.195 23.84 22.80 21.85 20.98 20.17 19.42 18.73 18.08 17.48 16.92 64.35 61.56 58.99 56.63 54.45 52.44 50.56 48.82 47.19 45.67 174.0 166.4 159.5 153.1 147.2 141.8 136.7 132.0 127.6 123.5 467.2 446.9 428.3 411.1 395.3 380.7 367.1 354.4 342.6 331.6 0.200 0.205 0.210 0.215
17、 0.220 0.225 0.230 0.235 0.240 0.245 16.39 15.89 15.42 14.98 14.57 14.17 13.80 13.45 13.11 12.79 44.24 42.90 41.64 40.45 39.33 38.26 37.26 36.30 35.39 34.53 119.6 116.0 112.6 109.4 106.3 103.5 100.7 98.2 95.7 93.4 321.2 311.5 302.3 293.7 285.5 277.8 270.5 263.6 257.0 250.7 0.250 0.255 0.260 0.265 0.
18、270 0.275 0.280 0.285 0.290 0.295 12.49 12.20 11.92 11.65 11.40 11.16 10.93 10.70 10. 49 10.28 33.71 32.93 32.18 31.46 30.78 30.12 29.50 28.89 28.32 27.76 91.2 89.0 87.0 85.1 83.2 81.5 79.8 78.1 76.6 75.1 244.7 239.0 233.6 228.4 223.4 218.7 214.1 209.8 205.6 201.6 0.300 0.305 0.310 0.315 0.320 0.325 0.330 0.335 0.340 0.345 10.08 9.89 9.71 9.53 9.36 9.20 9.04 8.89 8.74 8.60 27.23 26.71 26.22 25.74 25.28 24.84 24.41 24.00 23.60 23.21 73.6 72.2 70.9 69.6 68.4 67.2 66.0 64.9 63.8 62.8 197.7 193.3 190.4 186.9 183.6 180.3 177.2 174.2 171.3 168.5
