Portable universal tensile testing machine for studying mechanical properties of superelastic biomaterials

Abstract

A portable universal tensile testing machine for single and cyclic loading of superelastic biomaterials is presented. It’s an alternative to large-sized stationary universal testing machines. The machine is designed to obtain uniaxial cyclic tension stress-strain curves of materials with a low elastic modulus, including biological tissues. Its portability allows using it in various conditions: classrooms, production laboratories, and in the field. An interface has been developed to connect it to a computer. Computer output of experimental data allows recording and displaying load-displacement curves, setting the number of cycles, limits, and rate of cyclic deformation. Several examples of testing various biomaterials are presented. The functional advantage of the device is the wide tensile testing speed range of 0.01-10 mm/s and cyclic loading, which allow capturing viscoelastic and superelastic behavior of biomaterials.

Production and properties of electrically conductive polymer composites reinforced with cotton threads

“…The sample was placed in a universal tensile testing machine to obtain real-time loaddisplacement curves along with electrical measurements using a multimeter and a computer in Figure 3. 24 the space between the fibers and are held on their surface by adhesion forces. The choice of fibers interlacing in the knitted base of strain gages and the tape cutting orientation relative to the direction of the fibers of the knitted base have been previously justified.…”

Engineered Fibrous NiTi Scaffolds with Cultured Hepatocytes for Liver Regeneration in Rats

“…Briefly, FNTS-3D scaffolds (15 mm in diameter) were compressed four times to 10% height with 5 mm/min velocity using an Instron VNS 5969 univeral testing machine (Norwood, MA., USA). In the region of elastic linear deformation, the stiffness of the fibrous matrix was calculated as The mechanical properties of the NiTi wire were measured using a custom-build tensile testing apparatus designed specifically for this purpose. − …”

Influence of Wire Geometry on the Mechanical Behavior of the TiNi Design

“…The uniaxial stress-strain curves were obtained using a software-controlled electro mechanical test machine [28]. Tests were performed at room temperature with a tensio rate of 0.1 mm/s.…”

“…Tests were performed at room temperature with a tension rate of 0.1 mm/s. The force applied to the samples during the loading-unloading cycles was recorded with an accuracy of 0.004 N. The displacement accuracy was ±0.1 µ m. The method of sample fixation is presented in the work [28]. Special cylindrical clamps were used for the samples, where the wire was first wound over the cylindrical holder before it was secured with a screw, eliminating the stress concentration at the clamping points of the sample holder.…”