A tennis racquet extending along a longitudinal axis and capable of being tested under a lateral bending test and a forward/rearward bending test, includes a frame having a head portion, a handle portion, and a throat portion positioned between the head and handle portions. The head portion forms a hoop that defines a string bed plane. At least the head portion and the throat portion of the racquet are formed at least in part of a fiber composite material. The throat portion includes a pair of throat elements. When the racquet is tested under the lateral bending test, the racquet has a lateral deflection of at least 6.0 mm when measured in a direction parallel to the string bed plane and perpendicular to the longitudinal axis.

A specimen testing system has holders that hold a specimen for testing. The holders brace the specimen so that a load may be applied. A load applicator applies a load to the specimen at a location that is between the holders bracing the specimen. A user may adjust the load applicator until it applies the desired load to the specimen. If desired, a user may apply rotation to a specimen while it is experiencing a load by using a specimen rotation system. The user may continue to adjust the load applied to the specimen or continue to rotate the specimen during loading until the specimen fails.

A specimen testing system has holders that hold a specimen for testing. The holders brace the specimen so that a load may be applied. A load applicator applies a load to the specimen at a location that is between the holders bracing the specimen. A user may adjust the load applicator until it applies the desired load to the specimen. If desired, a user may apply rotation to a specimen while it is experiencing a load by using a specimen rotation system. The user may continue to adjust the load applied to the specimen or continue to rotate the specimen during loading until the specimen fails.

Systems and methods for classifying and sorting textile samples. A textile identification system may be configured to manipulate a textile sample in a manner that reveals a textile characteristic. For example, an elastic property of the textile sample is revealed by stretching or twisting the sample. The textile sample may be classified based on the textile characteristic. The textile sample may be sorted based on the classification.

Systems and methods for classifying and sorting textile samples. A textile identification system may be configured to manipulate a textile sample in a manner that reveals a textile characteristic. For example, an elastic property of the textile sample is revealed by stretching or twisting the sample. The textile sample may be classified based on the textile characteristic. The textile sample may be sorted based on the classification.

In a device for evaluating torsional structural performance of girder according to an embodiment of the present disclosure, a guide unit of a support member formed in a shape of an arc having its center that matches a shear center of the girder rotatably supports a rotating member, so that the shear center of the girder matches a center of torsion during clockwise or counterclockwise rotation of the rotating member, thereby measuring an accurate angle of twist and preventing an incident in which the rotating member escapes due to separation of a component by a rotational force.

In a device for evaluating torsional structural performance of girder according to an embodiment of the present disclosure, a guide unit of a support member formed in a shape of an arc having its center that matches a shear center of the girder rotatably supports a rotating member, so that the shear center of the girder matches a center of torsion during clockwise or counterclockwise rotation of the rotating member, thereby measuring an accurate angle of twist and preventing an incident in which the rotating member escapes due to separation of a component by a rotational force.

A racquet extending along a longitudinal axis and including a frame including a head portion, a handle portion, and a throat portion. The head portion forms a hoop that defines a string bed plane. At least the head portion and the throat portion of the frame are formed at least in part of a fiber composite material. When the racquet is tested under the racquet lateral bending test, the racquet has a lateral deflection of at least 6.0 mm when measured in a direction that is parallel to the string bed plane and perpendicular to the longitudinal axis. When the racquet is tested under the racquet torsional stability test, the racquet has an angular deflection of less than 5.5 degrees about the longitudinal axis. The head portion has a maximum beam height distance of at least 20 mm.

A racquet extending along a longitudinal axis and including a frame including a head portion, a handle portion, and a throat portion. The head portion forms a hoop that defines a string bed plane. At least the head portion and the throat portion of the frame are formed at least in part of a fiber composite material. When the racquet is tested under the racquet lateral bending test, the racquet has a lateral deflection of at least 6.0 mm when measured in a direction that is parallel to the string bed plane and perpendicular to the longitudinal axis. When the racquet is tested under the racquet torsional stability test, the racquet has an angular deflection of less than 5.5 degrees about the longitudinal axis. The head portion has a maximum beam height distance of at least 20 mm.

A testing apparatus for a flexible screen includes a slide rail, a reel, and a clamping member. The reel is disposed at an end of the slide rail in the extension direction of the slide rail which the axial direction of the reel is perpendicular to. The reel has a hollow structure and is connected to a evacuating device through a gas path formed in the hollow structure to enable the evacuating device to vacuumize inside of the reel to fit the flexible screen and coil around the reel. The reel is configured to affix first end of flexible screen and rotate to coil the flexible screen. The clamping member is configured to clamp a second end of the flexible screen opposite to the first end. The reel is further configured to rotate to drive, through the flexible screen, the reel and the clamping member to slide towards each other along the slide rail.