5results about How to "High shear modulus" patented technology

The invention discloses microcrystalline glass, the microcrystalline glass comprises a main crystalline phase (Zn, Mg) Al2O4, the average grain size of the crystalline phase in the microcrystalline glass is less than 10.00 nm, and the crystallinity of the microcrystalline glass is 20.00-50.00 wt%; the microcrystalline glass comprises the following components in percentage by mole of oxide: 38.00-45.00% of SiO2; the content of Al2O3 is 24.00 to 28.00 percent; 13.00% to 20.00% of MgO + ZnO (magnesium oxide + zinc oxide); zrO2: 3.00% to 5.00% of ZrO2; 2.00% to 11.00% of Li2O + Na2O (lithium oxide + sodium oxide); 3.00% to 9.00% of B2O3 (boron trioxide); meanwhile, the content of each oxide in the microcrystalline glass also meets the following relational expression: X = (Na2O + 2.35 * B2O3 + 1.52 * Li2O) / (0.96 * Al2O3), and X is more than or equal to 0.61 and less than or equal to 1.30. The microcrystalline glass with specific composition and microstructure provided by the invention can be molded into qualified curved microcrystalline glass through a 3D hot bending process, that is, the obtained curved microcrystalline glass keeps excellent optical performance, and the size change meets the requirements. According to the transparent spinel glass ceramic disclosed by the invention, the forming and transmittance change controllability in the 3D hot bending process can be realized.

The invention relates to a high-shear stripping-resistant PET (polyethylene terephthalate) foam material and a preparation method thereof, and the PET foam material is prepared from the following components in parts by weight: 60 to 90 parts of PET slices, 10 to 30 parts of bio-based nylon, 0.1 to 0.5 part of anhydride chain extender, 0.1 to 1 part of tetrafunctional glycidyl ester type epoxy macromolecule, 0.1 to 0.5 part of oxazoline chain extender and 0.1 to 3 parts of nucleating agent. And 0.1-1 part of an antioxidant. The shear performance and peel strength of the PET foaming material can be effectively improved, the PET foaming material can reach the level close to balsa wood, the proportion of the PET foaming material in the blade is further increased, and the purpose of reducing the proportion of the balsa wood is achieved.

This invention relates to the field of badminton racket technology, and in particular to an anti-torsion racket frame, comprising a head frame and a shaft. The head frame is formed by curing a composite prepreg and has a hollow cavity inside. A reinforcing core is partially or completely disposed within the hollow cavity. The head frame and shaft are fixedly connected. Carbon fiber composite prepreg is preferred as the composite prepreg. This invention also discloses a method for preparing the anti-torsion racket frame. The anti-torsion racket frame and its preparation method obtained by this invention embed a honeycomb-structured reinforcing core at the lower end of the head frame and fill it with foam material. Utilizing the high shear modulus of the honeycomb reinforcing core and the expansion and filling characteristics of the foam material, the torsional stiffness and overall strength of the corresponding area are enhanced without significantly increasing the weight of the head frame.

This invention provides a method for preparing oblique fiber honeycomb core material, comprising the following steps: A) designing a coating roller, wherein the adhesive lines of the coating roller form an acute angle with the axis of the coating roller; B) using the coating roller in step A) to transfer the adhesive to the surface of the woven fabric, obtaining a woven fabric coated with adhesive lines; C) cutting the woven fabric obtained in step B) to obtain several woven fabric strips; D) stacking the woven fabric strips sequentially to obtain multiple layers of woven fabric strips; E) curing the multiple layers of woven fabric strips with adhesive, and then stretching them to obtain oblique fiber honeycomb core material. This application also provides a method for preparing oblique fiber honeycomb core material with a different cutting direction for the woven fabric, but which can still achieve the same result. The method for preparing oblique fiber honeycomb core material provided by this application is simple to operate, can directly use traditional honeycomb core material production equipment, has high production efficiency, and the oblique fiber honeycomb core material prepared by this application can significantly improve the shear modulus of the honeycomb core material.

The present invention relates to the field of coal mine safety technology, and in particular to an impact energy absorption protective device with a non-uniform wall thickness rhombus composite structure, which aims to solve the problems of poor buffering energy absorption effect, poor collision resistance and impact resistance of existing impact energy absorption devices. The non-uniform wall thickness rhombus composite structure impact energy absorption protective device adopts a non-uniform wall thickness rhombus composite structure energy absorption layer as the main energy absorption component, and forms a composite honeycomb structure by combining a non-uniform wall thickness rhombus structure with a non-uniform wall thickness rhombus structure connecting arm. It not only fully utilizes the characteristics of the non-uniform wall thickness rhombus structure with small stiffness, excellent energy absorption characteristics, strong collision resistance and good bending resistance, but also gives play to the advantages of the honeycomb structure with light weight, high strength, high shear modulus, good notch resistance, fracture resistance, high resilience toughness, stable mechanical properties, excellent energy absorption capacity and strong impact resistance, so that the non-uniform wall thickness rhombus composite structure energy absorption layer has excellent energy absorption performance as a whole, and the structure is stable and reliable.