A method for testing the strength of a sheet-like element having two opposite faces and made of hard brittle material under tensile stress is provided. The method includes passing each of the faces of the element over a roller and thereby bending the element so that each of the faces is subjected to a first tensile stress in a portion in which the opposite face is in contact with a surface of the roller; exerting a second tensile force on the element in the direction of advancement so that both faces are subjected to the second tensile stress of at least 2 MPa so that the first and second tensile stresses add up to define a resultant tensile stress; and monitoring the element and determining whether the element has a defined breaking strength equal to the resultant tensile stress or whether the element breaks under the resultant tensile stress.

Embodiments of a system and a method for determining an edge hardness value for a cementitious board can be used to effectively determine the hardness of the board after it has been made and dried at a predetermined location, such as, at a stacking station, for example. An actuator assembly can manipulate a punch such that the punch is inserted into one of the edges of one of the cementitious boards in the stacker in a controlled manner. A force gauge can be associated with the punch to measure the resistance force exerted by the cementitious board in response to the punch being inserted into its edge. The measured resistance force can be used to determine the edge hardness value.

The present disclosure includes a method for determining a melt strength includes extruding one or more polymers to form the polymer film, passing the polymer film at least partially around a measurement roll coupled to a force measuring device, at least partially around a chill roll downstream of the measurement roll, and through a nip defined between two nip rolls, and measuring a force exerted on the measurement roll by the polymer film using the force measuring device. The polymer film is at least partially molten when contacting the measurement roll. A system includes an extruder, a measurement roll couple to one or more load cells, a chill roll coupled to a drive motor, at least two nip rolls downstream of the chill roll, and a take-up roll downstream of the nip rolls. The load cells measure a force exerted by the molten polymer film on the measurement roll.

An apparatus and a method for in-situ testing impact strength of a micro-structure are provided. In one embodiment, the apparatus includes: a flexible beam, one end of which being fixed; an impact mass block disposed at the other end of the flexible beam and being for exerting an impact on the micro-structure; and a locking member including a beam arm and a plurality of locking teeth. The beam arm is perpendicular to the flexible beam and one end of the beam arm is fixed, and the plurality of locking teeth are distributed at intervals along the beam arm, such that the other end of the flexible beam is engaged to one of the plurality of locking teeth when the flexible beam is loaded.

Disclosed is a method for the quality control of a component at least partially made of elastomer, particularly for a joint, including: a) carrying out at least one accommodation cycle on the component, the accommodation cycle involving applying a progressive compression force to the component and progressively releasing the compression force without pulling; b) applying a progressive compression force to the component in quasi static state according to a given component deformation predetermined profile; c) measuring the deformation of the component and the compression force applied while the compression force is applied; d) determining the conformity of the component under a loading other than that of the compression force of step b) from the measurement of the deformation of the component and the compression force applied.

Embodiments of a system and a method for determining an edge hardness value for a cementitious board can be used to effectively determine the hardness of the board after it has been made and dried at a predetermined location, such as, at a stacking station, for example. An actuator assembly can manipulate a punch such that the punch is inserted into one of the edges of one of the cementitious boards in the stacker in a controlled manner. A force gauge can be associated with the punch to measure the resistance force exerted by the cementitious board in response to the punch being inserted into its edge. The measured resistance force can be used to determine the edge hardness value.

Disclosed is an apparatus for in-situ testing impact strength of a micro-structure, comprising: a flexible beam, one end of which being fixed; an impact mass block disposed at the other end of the flexible beam and configured to exert an impact on the micro-structure; and a locking member comprising a beam arm and a plurality of locking teeth, wherein the beam arm is perpendicular to the flexible beam and one end of the beam arm is fixed, and wherein the plurality of locking teeth are distributed at intervals along the beam arm, such that the other end of the flexible beam is engaged to one of the plurality of locking teeth when the flexible beam is loaded. A method for testing an impact strength of a micro-structure is also disclosed.

A crack evaluation method of an additively manufactured object, which is a method evaluating a crack sensitivity of an additively manufactured object, includes the following. A crack evaluation device is additively manufactured using a raw material powder. The crack evaluation device includes: a body part, a base part opposed to the body part, a connecting part connecting one end side of the body part and the base part, a stress concentration part connecting another end side of the body part and the base part, and a comb tooth part connecting, by comb teeth, the body part and the base part between the connecting part and the stress concentration part. The crack sensitivity is evaluated based on cracked comb teeth at the crack evaluation device serving as the additively manufactured object.

A method for testing the strength of a sheet-like element having two opposite faces and made of hard brittle material under tensile stress is provided. The method includes passing each of the faces of the element over a roller and thereby bending the element so that each of the faces is subjected to a first tensile stress in a portion in which the opposite face is in contact with a surface of the roller; exerting a second tensile force on the element in the direction of advancement so that both faces are subjected to the second tensile stress of at least 2 MPa so that the first and second tensile stresses add up to define a resultant tensile stress; and monitoring the element and determining whether the element has a defined breaking strength equal to the resultant tensile stress or whether the element breaks under the resultant tensile stress.

In order to test battery plate packs (12, 13), the battery plate packs are transported between conveyor belts (5, 6) while compressed to a specified thickness, and the force required for the compression is detected by measuring cells (14) while the battery plate packs are being transported, which measuring cells are associated with a pressing plate (11) associated with one of the conveyor belts (5). If the force deviates from a specified value, the battery plate pack is evaluated as faulty and is ejected.