A portable Brinell testing apparatus that meets the load time requirements of the ASTM E10 standard. The invention uses a constant force spring connected to a lever arm which is pivoted on fulcrum 32. The mechanical advantage of the mechanism is able to achieve a force of up to 3000 Kgf with constant force spring 26 that can be activated by the operator.

A portable testing apparatus for a Brinell test meeting the load time requirements of the ASTM E10 standard. The apparatus incorporates a hydraulic accumulator acting on a cylinder which is connected to an indenter. The accumulator keeps a constant force on the indenter for the period of time of the test despite hydraulic leakage or creep of the indenter into the material that would cause a reduction in pressure if not for the accumulator. Usually, the test time length is 10 seconds. Pressure is set using springs usually in a settable sequence valve.

An apparatus for performing a contact mechanics test on a substrate includes a stylus, a core configured to engage the stylus against the substrate, a stylus engagement mechanism configured to induce a contact load or a penetration depth to the stylus, a core engagement mechanism configured to maintain contact of the core and to move the core along the substrate surface, a frame configured to be fixed with respect to the apparatus or to be moved together with the core engagement mechanism as an assembly, a frame engagement mechanism configured to engage the frame with the substrate surface; and a substrate monitoring device configured to measure characteristics of substrate contact response and/or collect material machined from the substrate. Methods of performing a contact mechanics test are also provided.

A method and apparatus for measuring a dynamic tensile stress and/or tensile strain response of a material such as an elastic material and/or a ductile material. The apparatus may include a striker bar, a stretcher bar, and a drive assembly configured to propel the striker bar toward the stretcher bar. The apparatus may further include a stationary specimen mount and a movable specimen mount that receive a test sample. The striker bar and the stretcher bar of the apparatus may provide a continuous stress on the test sample and an accurate tensile stress/strain measurement.

A hardness tester loads a predetermined test force on an indenter and presses into a surface of a sample to form an indentation. The indenter includes an indenter memory storing indenter information specific to the indenter. The indenter is detachably mounted to an indenter shaft. A CPU acquires, from the indenter memory, the indenter information of the indenter mounted to the indenter shaft, and uses the acquired indenter information to perform a predetermined operation and calculate hardness.

A glass sheet, the thickness of which is at most 2 mm, including a surface zone under compression and a central zone under tension, such that the depth at which the transition between compression and tension occurs is at least 100 micrometers, the ratio between the depth and the thickness being at least 0.1, the sheet additionally being such that the flexural stress at break in a ring-on-tripod test is at least 70 MPa, after Vickers indentation under a load of 60 N.

A hardness tester includes a memory storing, as a parts program, definitions of measurement conditions including a coordinate system and test position defined with respect to an image of a standard reference sample; a pattern searcher performing a pattern searching process, with reference to a plurality of samples to be measured, using a pattern image based on the image of the standard reference sample, and detecting a number of samples having a shape identical to that of the standard reference sample, as well as a position and angle of the samples having the identical shape; a pattern definer defining a coordinate system and test position for each of the samples having the identical shape based on the position and angle of each of the samples having the identical shape; and a measurer measuring the hardness of the samples for which the coordinate system and test position have been defined.

The present invention includes: an image capturer capturing an image of the sample to be measured; an image acquirer acquiring image data of the sample captured by the image capturer; a pattern searcher performing, on the image data of the sample acquired by the image acquirer, pattern searching process using a pattern image selected based on the sample and identifying a position in the image matching the pattern image; a profile extractor extracting a profile of the sample based on the position in the image identified by the pattern searcher; a calculator calculating a hardness measurement position of the sample based on the profile extracted by the profile extractor; and a measurer executing hardness testing on the sample based on the hardness measurement position calculated by the calculator and measuring the hardness of the sample.

A portable Brinell metal hardness tester has a test head mounted in a carriage, movable vertically along elevating screws, and includes a reciprocable pumping rack movable in response to manual movement of a pumping lever, for pumping hydraulic fluid into a passageway of the tester to increase hydraulic fluid pressure in the tester to a level required for metal hardness testing; and a stent located in the passageway for permitting pumped hydraulic fluid to flow through the passageway into a test head portion of the tester to apply hydraulic fluid to the ball contacting the test piece and interferingly stopping the rack upon movement of the rack into the passageway by a preselected amount.

Provided is a stress blank angle eliminating device and method for a dynamic true triaxial electromagnetic Hopkinson bar. Objectives of eliminating influence of a stress blank angle in a sample in a test and preventing permanent deformation caused by mutual collision between the Hopkinson bars are achieved. The adjustable test device for eliminating the stress blank angle eliminates influence of the stress blank angle generated by the sample in a triaxial six-direction dynamic impact test process, and is convenient for obtaining real dynamic failure parameters of the sample.