Note: The bending load fatigue test is based on the size of the wheel hub and the design load setting, the test bench applies bending stress to the wheel hub, and simulate the wheel hub in lateral movement such as steering, tail throwing, and other stress and rotational bending force to test the strength of the spoke, the joint of the spoke, and the rim
(Fatigue damage starts locally, so the fatigue test is very sensitive to internal defects, so the fatigue test also verifies the adverse effects of sand holes, pores, and shrinkage holes on the wheel hub)
The following conditions in the test are unqualified:
1. Visible cracks appear in any part of the wheel hub.
2. Before reaching the required number of cycles, the offset of the loading point exceeds 10%.
3. The wheel hub can not continue to bear the load.
Note: The radial fatigue test is based on the design load setting of the wheel hub, and the radial testing machine applies a constant radial load to the wheel hub for the rolling test. Simulate the fatigue effect of wheel hub rotation under long-term load on the rim. It mainly tests the rolling strength of the rim.
(Fatigue damage starts locally, so the fatigue test is very sensitive to internal defects, it largely verifies the influence of sand holes, pores, and shrinkage holes on the wheel hub)
The following conditions in the test are unqualified:
1.Any part of the wheel hub with visible fatigue cracks. (Check by dye penetration or fluorescence detection)
2. The wheel can not continue to bear the load to the required number of cycles.
Notes: 13° impact test is designed to test the comprehensive strength of the wheel hub. According to the design load setting of the wheel hub, the impact test equipment imposes a heavy hammer impact on the rim with a 13° , simulating the vehicle accidentally hitting stones and steps in the process of driving. The rim damage is caused by pothole-type obstacles and the lateral impact damage of the spoke test.
The following conditions in the test are unqualified:
1. There are penetrating cracks in the spoke.
2. The spoke is broken and separated from the rim.
3. Tire pressure completely disappeared within 60 seconds.
Notes: SSDP adopts a 30° impact test after the 13° impact test is finished, the equipment exerts a heavy hammer impact on the rim, the use of 1010KG weight, 255MM height from 30°, simulate the vehicle in the process of driving at different angles hit the stone, steps, potholes and other obstacles caused by the damage of the rim and the lateral impact of the spoke by the test.
The following conditions in the test are unqualified:
1. There are penetrating cracks in the spoke.
2. The spoke is broken and separated from the rim.
3. The tire pressure completely disappeared within 60 seconds.
Notes: SSDP quality standard adds 90° impact test after the 13° and 30° tests are finished, the equipment exerts a heavy hammer impact on the hub, using 1010KG weight at 160MM height from 90° to impact the part of the rim and tire contact. Simulate the wheel rim damage and the lateral impact damage test caused by the vehicle hitting stones, steps, potholes, and other obstacles at different angles in the process of driving.
The following conditions in the test are unqualified:
1. There are penetrating cracks in the spoke.
2. The spoke is broken and separated from the rim.
3. The tire pressure completely disappeared within 60 seconds.
The impact weight weighs 1010KG and the impact height is 160MM.
Note: The SSDP quality standard adds the deformation radial fatigue test, which adopts a radial direction of 90°, 1010KG load, and 15MM height impact to deform the rim, and then does the radial negative load 500,000 cycle fatigue test after the rim deformation, which is the most strict rim test, testing the impact resistance and fatigue resistance of the rim.
The following conditions in the test are unqualified:
1. There are penetrating cracks in the rim during impact.
2. The spoke is broken and separated from the rim.
3. Tire completely loses air pressure within 60 seconds.
4. Cracks are visible within 500,000 cycles.
5. There is gas leakage within 500,000 cycles.
The impact weight is 1010KG, the impact height is 15MM, and the wheel hub does radial load fatigue 500,000 cycles after the impact.
We officially launched "SSDP+", further improving the durability fatigue strength of the product based on the original "SSDP", so that it can reach a more stringent 1 million RPM. This new quality system standard "SSDP+" will be applied to all MMX forging wheel products and the "SSDP+" logo will be engraved on the products that comply with the "SSDP+".
Comparison of car wheel test standards:
Test items | Japan JWL | Usa DOT-T | Germany TUV | SSDP | SSDP+ |
Bending fatigue test | 100,000 cycles | 100,000 cycles | 200,000 cycles | 150,000 cycles | 200,000 cycles |
Radial fatigue test | 500,000 cycles | 500,000 cycles | 1,000,000 cycles | 800,000 cycles | 1,000,000 cycles |
13°impact test | 230MM | 230MM | 230MM | 255MM | 255MM |
30°impact test | — | — | — | 1000KG/255MM | 1000KG/255MM |
90°impact test | — | — | — | 1000KG/160MM | 1000KG/160MM |
90°impact test + radial fatigue test | — | — | — | 1000KG/15MM+ 500,000 cycles | 1000KG/15MM+ 500,000 cycles |
Through the continuous innovation of wheel products and the continuous exploration of new technology applications, MMX always keeps passion and constantly improves the service system to provide every MMX user a high-quality experience. Thank you for your love of MMX.
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