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Material performance testing including improved load detection

  • US 10,641,690 B2
  • Filed: 01/08/2018
  • Issued: 05/05/2020
  • Est. Priority Date: 01/06/2017
  • Status: Active Grant
First Claim
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1. A material testing apparatus, the apparatus comprising:

  • an actuator to drive a load head according to electronic control signals, wherein the load head supplies a load to a material specimen in a first dimension, wherein the actuator applies the force to the load head;

    a plurality of load line displacement (LLD) reference points that extend radially outward from the load head;

    a plurality of LLD measuring devices that correspond to the plurality of LLD reference points, each of the plurality of LLD measuring devices (i) being positioned to detect a position of a corresponding LLD reference point along the first dimension and (ii) being configured to transmit position signals to a controller; and

    a load cell to measure the load supplied to the material specimen by the load head, wherein the load cell is configured to transmit load signals to the controller,wherein the controller is programmed to perform a performance test on the material specimen using (i) a combination of the position signals from the plurality of LLD measuring devices and (ii) the load signal from the load cell, and wherein the controller determines and provides the control signals to the actuator so that a target rate of LLD is achieved during the performance test, andwherein the combination of position signals comprises an average of the position signals.

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