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Great video! A couple small constructive criticisms for increased accuracy, these are in exact chronological order, these recommendations are for Testing in Tension in accordance with ASTM E4, ASTM E4, and ASTM E83 for Calibration and ASTM E8 for testing and good practice in accordance with industry norms. 1) The test specimen shall be hung from the top grip, leaving the bottom disconnected. 2) Tare the loadcell/force channel. 3) Connect the lower grip to the specimen. 4) Install the extensometer. 5) Remove the Gage Length setting zero pin or release the zero mechanism. 6) Zero the extensometer/strain channel. 7) Zero the crosshead/displacement encoder channel. 8) Apply desired preload. 9) Begin test. This method ensures that the loadcell and test specimen are only experiencing applied forces which is arguably the goal. Additionally this insures the stress/strain of preload is captured by the extensometer, this means your strain reading won't start at zero it will be offset by whatever amount of strain the preload imparts on the specimen/extensometer. But that's okay because preload is generally designed to make up for mechanical slop of the fixtures that you don't want in the force graph as it's generally non linear, but it is helpful to at least include the extra strain as a zero offset for informational purposes. This method also makes sure to capture any absolute crosshead displacement that may be lost if you are zeroing the crosshead after preload. Again this will cause a zero offset at the starting position of the test graph but that is okay since it does capture some informational data without plotting the nonlinearities on the graph. That being said, none of this is a deal breaker or risks data legitimacy and the way MTS is performing this test is completely valid and in line with industry standards/specs but what I am recommending just gets you that extra 0.1% of accuracy and can reduce your total expanded uncertainty. But MTS is a well regarded company who knows their stuff and follows the specs so I am in no way saying this is wrong because it isn't, I'm just recommending some additional steps to increase accuracy. Thanks for the video!
Thanks for the feedback. Videos regarding TestSuite operation can be found on the MTS customer portal at my.mts.com/en/support/home. Hope you can find what you need!
Hello, is there any way to test seatbelt durability in home conditions? There is this small company offering custom seat belts but I am scared they might be using some knock-off belts for their work. And I want to find out sooner rather than later if these belts can compare to the stock ones (I should be able to ask them to send me a sample). Thanks!
Excellent suggestion! We plan to include more data in future Smashing Science videos. Since seatbelts are a regulated device, we were not able to share the data from this specific test.
Fascinating!! But I agree with @cdmrallen that the results of the test are incomplete without reporting something about the axial load. Assuming your fixturing is sufficiently rigid, You could create an X-Y plot showing how axial load rises due to the cam effect as a function of torque. If your fixturing flexes too much, you could get around that issue by applying a constant axial load and reporting peak torque applied before the camming effect takes over. I would recommend using an axial load value based on the weight of an adult or about 200 lbs. (890 newtons). You should also test the Robertson screw aka square screw or Scrulox screw which is preferred by many builders and is more commonly used in Canada . My money says the square screw beats out all the others except for the Torx bit. en.wikipedia.org/wiki/Robertson_screw
Semi-Active Longitudinal Restraint System: When combined with the Brake Intensifier Package, the Semi-Active Longitudinal Restraint System provides complete dynamic control of the simulation mode. During non-braking events, the vehicle body floats naturally. When a braking event is encountered, the longitudinal restraint and the brakes lock to provide a reaction to ground. The restraint system is fixed to the front and rear of the vehicle structure through the bumper mounts. Actuators are coupled through airbags, bell cranks and struts. The airbags deflate during non-braking events, effectively decoupling the restraint.
Hi, nice video. Can u please tell what is the criteria to select the type of sample for composite materials for tensile testing? Material is Polymer matrix embedded with solid particles of 80 micron size.
