Ross Flex Test

Copolyesterether elastomers have excellent resistance to flex fatigue. For example, in the Ross flex test (ASTM D1052), all of the samples listed in Table 13 resisted cut-growth over 300,000 cycles. 

Ross flexing test Measurement of cut growth when subject to repeat bend flexing ASTM 1052 [141] ATS FAAR Code No. 10.64002... 

ASTM D 1052-85 Standard Test Method for Measuring Rubber Deterioration—Cut Growth Using Ross Flexing Apparatus, 4 pp (Comm D-11)... 

There are several common flex life machines including MIT Flex, Ross Flex, and DeMattia Flex. The MIT Flex test is used to measure the abihty of plastic films to withstand fatigue from flexing. This... 

Figure 1.24 Photograph of a Ross Flex tester. Photo courtesy of Presto Testing Instruments.

The control of minimum strain is even more important than the control of maximum strain in a flexing cycle because rate of cracking is much increased if this is zero. In all the methods described above, the strain is deliberately intended to be zero, but probably only in the Ross apparatus is this achieved precisely and in a reproducible manner. In all bending methods, the maximum strain depends on the thickness of the test piece and, hence, this must be closely controlled. 

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