A system for in-situ testing of mechanical properties of materials in static and dynamic load spectra, that includes: an Arcan biaxial clamping subsystem, a press-in test subsystem, a biaxial fatigue test subsystem, a biaxial pre-tension loading subsystem, a signal detection subsystem, and a support and adjustment subsystem. A combined guide mechanism in the Arcan biaxial clamping subsystem is rigidly connected to a guide mechanism support block, an x-direction three sensor base and a y-direction force sensor base in the support and adjustment subsystem by threaded connections, respectively. A laser transmitter, a voice coil motor and a laser receiver in the press-in test subsystem are rigidly connected to a two-degree-of-freedom electric moving platform for the laser transmitter, a two-degree-of-freedom electric moving platform for the voice coil motor and a two-degree-of-freedom electric moving platform for the laser receiver in the support and adjustment subsystem by threaded connections, respectively.

A transparent constraint apparatus for the normal deformation of a planar model, including rigid transparent retainer plates, a planar model, and magnetic force components. The magnetic force components are provided at edge positions of the rigid transparent retainer plates; the normal direction of the planar model is parallel to the normal direction of the two rigid transparent retainer plates, and said two retainer plates are symmetrically arranged relative to the plane of symmetry of the planar model; the magnetic force components are symmetrically arranged relative to the plane of symmetry of the planar model, mutually symmetrical magnetic force components producing mutually attractive magnetic force. The transparent constraint apparatus solves the problem of constraining the normal deformation of a planar model under planar-strain conditions during testing.

A mechanical material property test fixture for testing a material, the fixture includes a plurality of beams disposed on one geometrical plane, a plurality of linear bearings, a plurality of hinged linkage bars, and an apparatus that applies force on the plurality of linear bearings such that the material being tested has a uniform force applied on it by the fixture. Each beam has substantially equal angles between adjacent beams, while each linear bearing is disposed on a corresponding beam. The linear bearings are attachable to the material being tested. Each linkage bar communicates with two adjacent linear bearings such that the linear bearings can freely slide along the corresponding beam. The linkage bars are substantially the same length such that a symmetric multi-axial movement in the linear bearings is created, and allows for equal force to be applied to the material.

The present invention corresponds to a machine for testing mechanical properties of hollow cylinders. The machine comprises an open container in which the hollow cylinder is arranged. Inside the hollow cylinder there is an expanding cylindrical membrane, which is connected to a pressure unit that supplies a pressurized fluid to the expanding membrane. A valve and a pressure sensor are located between the pressure unit and the expanding cylindrical membrane. A control and data capture system is connected to the pressure unit, the valve and the pressure sensor. The machine performs tensile and compression tests on hollow cylinders.

A portable flexure fixture including a fixture housing, a translatable plug, a load ring, and a support ring. The fixture housing includes a first end opposite a second end, a plug receiving opening extending into the first end and a test opening extending into the second end. The support ring is disposed in the fixture housing. The translatable plug is insertable into the plug receiving opening of the fixture housing and is translatable in both a sample engaging direction and a sample releasing direction. Further, the load ring is coupled to the translatable plug and is positioned at a sample facing end of the translatable plug such that translation of the translatable plug in the sample engaging direction translates the load ring in the sample engaging direction and translation of the translatable plug in the sample releasing direction translates the load ring in the sample releasing direction.

A system for in-situ testing of mechanical properties of materials in static and dynamic load spectra, that includes: an Arcan biaxial clamping subsystem, a press-in test subsystem, a biaxial fatigue test subsystem, a biaxial pre-tension loading subsystem, a signal detection subsystem, and a support and adjustment subsystem. A combined guide mechanism in the Arcan biaxial clamping subsystem is rigidly connected to a guide mechanism support block, an x-direction force sensor base and a y-direction force sensor base in the support and adjustment subsystem by threaded connections, respectively. A laser transmitter, a voice coil motor and a laser receiver in the press-in test subsystem are rigidly connected to a two-degree-of-freedom electric moving platform for the laser transmitter, a two-degree-of-freedom electric moving platform for the voice coil motor and a two-degree-of-freedom electric moving platform for the laser receiver in the support and adjustment subsystem by threaded connections, respectively.

Disclosed is a double-cross composite fabric membrane biaxial tensile strength test piece, comprising a core region and four cantilevers. The four cantilevers extend outwards around the core region and form a cross shape. Each cantilever is connected to the core region via an edge transition region. An end portion of the cantilever is a clamping section. The clamping section is provided with a clamping end rubber rod. The clamping end rubber rod is used for connecting to a clamp of a biaxial tensile testing machine. The clamping section is three-layered. The cantilever and the edge transition region are double-layered. The core region is single-layered. The edge transition region is in the shape of a quadrangle rounded at four corners. A manufacturing method of the test piece is also disclosed. By means of the method, the biaxial tensile strength of a fabric membrane can be measured and characterized, damage occurs in the single-layered test region, and the cantilever and the transition region are damaged later due to being strengthened. The method may be applied to architectural membranes, airship skins, and other industrial fabric fields.

The present disclosure relates to a system (10) for measuring the mechanical properties of a skin sample (3) ex vivo or in vitro, comprising a measuring device comprising at least one mechanical stress module (20, 40) capable of applying a tensile force to the skin in a direction parallel to the surface of the skin sample (3), the at least one mechanical stress module (20, 40) comprising: a traction means (30, 50) which is translatably movable in a direction parallel to the surface of the skin sample (3); a translating arm (21, 41) connected, on the one hand, to the traction means (30, 50) and, on the other hand, to an axial displacement means; one end of the traction means being provided with an attachment head (31, 51) capable of being attached to a region of the skin sample (3) so as to cause deformation of the skin sample by axially displacing the region of the skin sample a control unit (202) configured to control the displacement means according to a stress frequency of between 0.1 mHz and 1 Hz, and a calculation unit (203) configured to receive the signals transmitted by the measuring device and calculate the mechanical properties of the skin from the signals.

The present invention corresponds to a machine for multiaxial fatigue comprising a rotational mechanism, which is formed from a first power shaft with a first end connected to a first motor by means of a first coupling element; and a second end connected to a first fastening element. Moreover, the rotary mechanism has a driven shaft arranged collinearly with the first power shaft. This driven shaft has a first end connected to a fixed bearing; and a second end connected to a second fastening element. The second fastening element is arranged collinearly with the first fastening element; and a second coupling element connecting the first end to the second end.

Moreover, the machine has a reciprocating mechanism comprising a second power shaft connected to a second motor; a linear rotational transmission connected to the second power shaft; where the linear rotational transmission includes a bearing that connects to the driven shaft; and where the bearing applies a radial load on the driven shaft.

A machine that can stretch a material sample biaxially is disclosed. The material sample is gripped on four sides using two pairs of opposing gripping assemblies. Each gripping assembly comprises of multiple individual grippers which can slide towards or apart from each other. The two pairs of opposing gripping assemblies can be slid towards or away from each other, producing either equal or unequal stretches in the two directions. Each individual gripper slides in a direction perpendicular to the direction in which its respective gripping assembly can move as a unit. As the gripping assemblies are moved, the individual grippers are also moved in such a way as to maintain the rectangularity of a rectangular region of the specimen as much as possible.