เครื่องทดสอบความล้าของโฟมแบบลูกกลิ้ง Roller Shear Machine
เครื่องทดสอบความล้าของโฟมแบบลูกกลิ้ง Roller Shear Machine กำหนดความต้านทานต่อความล้าในการบีบอัดของโพลียูรีเทนเซลลูลาร์ที่มีความยืดหยุ่น ทำได้โดยใช้การทดสอบการบีบอัดลูกกลิ้งแบบไดนามิก
The Roller Shear Machine determines the resistance to compression fatigue of flexible cellular polyurethane. It does this by using a dynamic roller compression test.ASTM D1564.
Additional information
Description
The Roller Shear Machine fatigues a specimen dynamically with a constant force. Moreover, it deflects the material both vertically and laterally. Majority of companies within the foam industry use this to test quality of foam. This is because the machine accurately determines the percentage loss in thickness.
The Roller Shear Machine has been specially designed and manufactured in accordance with international standards. It is used to fatigue a specimen dynamically at a constant force, deflecting the material both vertically and laterally.
There are two procedures that can be used with the Roller Shear Machine. Both procedures are the same, and vary only in the number if cycles required to test the specimen. Procedure A uses 8000 cycles for testing, while Procedure B uses 20 000 cycles for testing.
Test Apparatus
The Roller Shear Machine is manufactured using the following components:
- Perforated-Base Platen: measuring 500mm x 500mm by 10mm. The centre section has 6.5mm holes covering a total area of 360mm x 360mm
- Roller: measuring 450mm in length with a diameter of 76.0 ± 1.3mm
- Counter: To set the counter to the predetermined test procedure: Procedure A: 8000 cycles & Procedure B: 20 000 cycles
- Limit Switches: installed in the Roller Shear Machine for added safety. If the doors of the machine are opened during a test, the test will automatically stop. To begin testing again, close the doors and press the START button.
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เครื่องทดสอบความล้าของโฟมแบบลูกกลิ้ง Roller Shear Machine
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