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2162 results about "Flexural strength" patented technology

Flexural strength, also known as modulus of rupture, or bend strength, or transverse rupture strength is a material property, defined as the stress in a material just before it yields in a flexure test. The transverse bending test is most frequently employed, in which a specimen having either a circular or rectangular cross-section is bent until fracture or yielding using a three point flexural test technique.

Strengthened, light weight wallboard and method and apparatus for making the same

A novel wallboard composition is disclosed comprising a unique combination of synthetic binders selected for their ability to establish a strengthened permanent bond in the final dry state for use in a wallboard composition comprising primarily gypsum, and in a wallboard composition comprising an expanded mineral such as Perlite which largely reduces the amount of gypsum over current gypsum wallboard formulations, thus reducing the weight while maintaining the strength of the wallboard structure. In a preferred embodiment, the lightweight, strengthened wallboard of the present invention also comprises an optional covering veneer that is applied to the top ply of the face paper to provide increased strength, moisture resistance, and fire retardency, and the back paper top ply is treated to provide increased flexural strength. Additionally, this invention relates to the unique manufacturing process to produce the wallboard composition of the present invention in order to create a lightweight, strengthened, moisture resistant, and fire retardant wallboard used to cover walls and ceilings in construction applications. Still further, this invention relates to the apparatus for manufacturing the wallboard composition of the present invention, including a method and apparatus for economically converting a standard gypsum wallboard manufacturing facility into a facility for manufacturing wallboard of the present invention.

Geometrically Apertured Protective and/or Splint Device Comprising a Re-Mouldable Thermoplastic Material

A protective and/or splint device, for example a distal radial splint device (200), comprises a protective and/or splint member (201) and a spacer member (13). The protective and/or splint member (201) comprises a composite protective and/or splint material and is formable at a forming temperature and is substantially rigid at ambient temperature. The material comprises a polycaprolactone and a ligno-cellulose additive material. The protective and/or splint member (201) comprises a mesh of elements (202), with a plurality of openings (203) through the protective and/or splint member (201). Away from the periphery of the splint member (201), the openings (203) are diamond-shaped. Two border elements (204) extend along the two sides of the periphery of the splint member (201). The three point bending strength to openness ratio of the member is greater than 0.1 and the unidirectional bending strength to openness ratio of the member is greater than 4. This results in a device (200) with sufficient strength, which is breathable with open surfaces, and the volume of material used is optimized. The strength of the member (201) parallel to the longitudinal direction of the arm is greater than the strength parallel too the circumferential direction. At the forming temperature the member (201) is stretchable. The member (201) is rounded between the outer surface of the member (201) and the edges around the openings (203).

Carbon-based nano cast nylon composite material and in-situ polymerization preparation method thereof

The invention discloses a carbon-based nano cast nylon composite material and an in-situ polymerization preparation method thereof. The method is characterized by comprising the following steps of: heating a caprolactam raw material to between 70 and 120 DEG C for melting, adding carbon-based nano particles into the caprolactam melt in a weight ratio of the carbon-based nano particles to the caprolactam monomer of 0.1-5: 100, namely uniformly dispersing carbon-based nano particle graphite oxide or graphene into the caprolactam melt by using ultrasonic wave or in a grinding mode, heating the mixture to between 110 and 150 DEG C, dehydrating the mixture for 5 to 30 minutes under the vacuum of 0.05 to 0.098MPa, adding 0.1 to 1 weight part of catalyst and 0.1 to 1 weight part of cocatalyst into the mixture, casting the uniform mixture into a die preheated to between 150 and 180 DEG C, keeping the temperature for 30 to 60 minutes, and cooling the mixture to obtain the carbon-based nano cast nylon composite material. Compared with the carbon-based nano-free cast nylon material, the mechanical properties of the carbon-based nano cast nylon composite material such as tensile strength, tensile modulus, bending strength, elongation at break and the like are improved by 5 to 20 percent, and the abrasion resistance of the cast nylon composite material is improved.
Owner:泸州市科华工程塑料有限公司 +1

High-ductility polymer-rubber powder-honey-combed cement concrete road covering material and construction process thereof

Disclosed is a cover material of polymer modification rubber powder porous concrete with high toughness and a making technique thereof. Wherein, in per cubic meter of the concrete, the polymer is 20 to 75 kg, the cement is 200 to 400 kg, and the water to cement ratio is between 0.25 to 0.40 ; in aggregates, the amount of a fine aggregate is less than or equal to 20 percent, and the amount of a coarse aggregate is more than or equal to 80 percent; 0 to 5 kg of plasticizer and/ or defoamer are/is added; rubber powder, whose volume fraction is not more than 50 percent, is used to replace the natural aggregate ; or the cement is replaced by mineral admixtures which are not more than 40 percent. The cover material is made by a small machine, a three-roller and an asphalt paver. The main technical parameters of the cover material are as follows: compressive strength is more than or equal to 15 MPa, flexural strength is more than or equal to 5 MPa, anti-skid structure depth is more than or equal to 2.0 mm, porosity is 18 to 22 percent, permeability coefficient is more than or equal to 1.5 mm/s, sound absorption coefficient is more than or equal to 0.30, and noise reduction effect is more than or equal to 5 dB. The cover material can comprehensively utilize the discarded rubber with the advantages of high toughness, sliding resistance and sound absorption and noise reduction. Thus, the cover material is applicable to the covers of the highway, the municipal road and the flat.

Method for detecting mechanical properties of local heating loading test material under high temperature oxidation environment and device thereof

The invention provides a test method capable of simply and conveniently testing mechanical properties of tensile strength, compressive strength, bending strength and fracture toughness of ceramic material and composite material thereof under superhigh temperature oxidation environment with the temperature of more than 1500 DEG C and a test device thereof. The test device is composed of a test frame, a fixed sample system, a loading system, a superhigh temperature flaming heating system, a record display system and a non-contact type infrared temperature measuring system. The method includes that acetylene or gasoline aeration flaming technology is adopted to locally and rapidly heat a sample, so that local temperature thereof reaches more than 1500 DEG C, a portable tester is utilized to apply bending, stretching or compressive load on the sample, and load value is recorded, thus obtaining mechanical properties of material. The invention has the advantages that operation is simple, the technology of local high temperature and synchronous loading on superhigh temperature sample is realized, superhigh temperature mechanical properties which can not be tested before such as strength and toughness of material can be conveniently measured under superhigh temperature oxidation environment by utilizing the test device of the invention.
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