A method of testing a material sample of a type used in a wall of a structure in a standard test for in-plane fracture toughness evaluation. The method comprises obtaining a sample having a lateral length no larger than a thickness of the wall of the structure, shaping the sample to have (a) a bottom surface, (b) a profiled top surface having a central notch, (c) a first coupling feature on a first side of the central notch, and (d) a second coupling feature on a second side of the central notch, assembling a test specimen which increases the width of the sample beyond the lateral width by coupling a first lateral extension to the first coupling feature and a second lateral extension to the second coupling feature, and applying a standard fracture toughness test to the so-assembled test specimen and sample to evaluate the fracture toughness of the sample.

Test fixture grips for testing quasibrittle materials, such as fiber-polymer composites are provided having increased mass and stiffness relative to standard test grips to provide for obtaining postpeak measurements. The design is based on static analysis (using the second law of thermodynamics), confirmed by dynamic analysis of the test setup as an open system. Dynamic analysis of the test setup as a closed system with PID controlled input further indicates that the controllability of postpeak softening under CMOD control is improved not only by increasing the grip stiffness but also by increasing the grip mass.

A test coupon (1) for an ISO-standard-conforming test method for testing a material hardness of gearwheels. The test coupon (1) is designed as a two-piece test coupon (1) including a casing body (2) and a test body (3). The test coupon (1) being tested by an ISO-standard-conforming test method for determining a material hardness of the gearwheels.

A method for determining material failure that includes the steps of: fabricating a coupon made of a material; applying first force and second forces on the coupon, where the second force is different than the first force; and characterizing a material failure due to the application of the first force and the second force to the coupon.

A technology for evaluating forming allowance for a bending crack at a sheared end face of the press-formed component from shape information of an actual component. The method includes applying press forming including bending deformation to a metal sheet being sheared to manufacture a press-formed component, evaluating forming allowance for a bending crack at a sheared end face being an end face subjected to the shearing. A crack index value for evaluating the bending crack at the sheared end face of the press-formed component is obtained from a bend outer side strain at or near the sheared end face acquired on a basis of a component shape of the press-formed component and a press die bend radius at a portion forming the sheared end face in a press die used in the press forming, and the forming allowance for the bending crack is evaluated by the obtained crack index value.

A coupon suitable for peeling tests, derived from a vane and including: (i) a portion of blade that comprises an intrados surface, an extrados surface and a leading edge and/or trailing edge and (ii) a vane reinforcement that covers and is glued to at least a part of the intrados surface, a part of the extrados surface and which extends beyond the leading and/or trailing edge. The reinforcement is split over the entire length of the leading edge and/or trailing edge such that the reinforcement is separated into two plates separate from one another and facing each other on either side of the slit beyond the leading and/or trailing edge. Furthermore, at least one of the plates furthermore comprises, beyond the leading and/or trailing edge, notches configured to provide a hold to this same plate.

A method according to the present invention, it is possible to accurately measure the stretch-flangeability of sheet metal materials without size effects even when a small amount of specimen is used, compared with the stretch-flangeability established as an international standard, and to measure the stretch-flangeability in the local region. The method according to the present invention includes (a) performing a computer simulation of a small-scale specimen having a predetermined size by using finite element analysis to determine a size of the small-scale specimen; (b) using a standard-scale specimen having the same material as the small-scale specimen specified in the step (a) to perform a punching process specified in the standard testing method; (c) observing a distribution pattern of shearing defects in a hole-edge region of the specimen having performed the punching process, and evaluating a hole expansion ratio; (d) comparing the hole expansion ratio and the distribution pattern of shearing defects between the small-scale specimen and the standard-scale specimen to verify measurement reliability for the stretch-flangeability of the small-scale specimen; and (e) using the size of the small-scale specimen having verified the measurement reliability to evaluate stretch-flangeability.

This disclosure provides methods of predicting the steady state small scale critical temperatures (S4 T.sub.c) of polymer resins and pipes therefrom.

The present invention discloses an experiment device and a method for detecting abrasion of a conveyer. The device comprises a rack, a reciprocation sliding mechanism, a speed adjusting mechanism and a crankshaft, wherein the reciprocation sliding mechanism comprises scrapers and scraper chains; the scraper chains are arranged between an upper-layer scraper and a lower-layer scraper; the speed adjusting mechanism comprises a motor, a friction driving wheel and a friction driven wheel; the motor is connected with the friction driving wheel through a motor shaft; the friction driving wheel slides on a shaft in an axial direction; speed adjustment can be achieved by changing the distance between the centers of the friction driving wheel and the friction driven wheel. Due to the adoption of the speed adjusting motor, the speed can be precisely controlled; as the crankshaft is arranged on the shaft of the friction driven wheel and connected with the reciprocation sliding mechanism through two connecting rods respectively, the scraper chains and chain devices are driven in a reciprocation manner at the adjusted speed, so as to realize reciprocation motion of a material inside a groove. The present invention can simulate friction between friction pairs of the actual conveyer well when the material is conveyed, and avoid experiment on a complex conveyer structure.

The fatigue cracking machine for circumferential notched tensile (CNT) specimens is a device for pre-cracking a CNT specimen prior to SCC testing. The machine uses a specimen holding cylinder attached to the shaft of a motor by a coupling, the holding cylinder being rotatably mounted in a bearing mounted in a bearing support fixed to a platform. The machine also uses a load cylinder rotatably mounted in a load bearing supported in a load fork, the load fork having a shaft adjustably mounted in a bearing support block. A dial indicator is fixed to a post rigidly mounted on the platform with the indicator's plunger bearing against the load bearing. An adjustment bolt bears against the end of the load fork shaft to displace the load bearing, applying a bending force to the specimen while it rotates, the displacement being measured by the dial indicator.