SAE J1636:2017 pdf free

SAE J1636:2017 pdf free.Recommended Guidelines for Load/Deformation Testing of Elastomeric Components
Mechanical Preflexing- -It is well known that elastomers undergoing load/deformation tests will progressively change for up to the first 1000 cycles until a steady-state condition is reached. Depending on the elastomer,this change ranges from about 3 to 25%. It is also known that most of the stiffness on the first cycle can be regained if a period of about 8 h or more elapses between load deflection tests. Consequently, preflexing influences must be considered. For preflexing to be effective, the load and/or deflection must be at least that at which the stiffness is to be determined.
Temperature Changes- Since elastomers are viscoelastic materials, it is necessary to know the temperature of the specimen and its temperature history prior to testing. Storing a specimen in a very cold or hot atmosphere prior to testing will influence the static data in mechanical testing as well as the time to wait before regaining the first static data after preflexing.
Aging- -Assembled components require sufficient time for the elastomeric material to integrate effects such as assembly oil or precompression. One week is recommended. Oven aging for3 h at 70 °C is sometimes used as a substitute for natural aging. This serves to yield more uniform results.
Test Setup- -The type and manner of fixturing a component for evaluation greatly affects the validity of the measured data. The geometry and loading procedure for each fixture should be clearly specified.
Axial – The test fixture must maintain any predefined relationship between the source of loading or deformation and the component under test during the entire test sequence.
Rotational – For evaluation of components in rotational modes (i.e., torsional or conical) it will be necessary to specify the mode of loading as rotational with a torque and center of rotation (provides rotation input only) or linear with a force and lever arm (provides rotation and translational inputs). Care should be taken to maintain the predefined geometrical relationships between the fixturing and the component under test during the entire test sequence. Please refer to SAE J1883 for assistance in the definition of the geometric environment for any particular test.SAE J1636 pdf free download.