100 results about "Total strain" patented technology

A method of determining the fatigue life of a structure includes the steps of:associating a mathematical equation for total strain amplitude with the structure:Δɛ2=σf′E(2Nf)b+ɛf′(2Nf)c,where: Δε / 2=strain amplitude, σf′=fatigue strength coefficient associated with a material of the structure, b=fatigue strength exponent of the material, E=cyclic modulus of elasticity of the material, 2Nf=number of cycles, εf′=fatigue ductility coefficient of the material, and c=fatigue ductility exponent of the material;reducing the fatigue strength exponent (b) such that an elastic portion of a total strain amplitude curve associated with the equation has a reduced slope to account for variable amplitude loading for the structure;generating a total strain amplitude curve, based upon the mathematical equation:Δɛ2=σf′E(2Nf)breduced+ɛf′(2Nf)c,where (breduced) is now the reduced fatigue strength exponent; anddetermining a fatigue life of the structure, based on the total strain amplitude curve with the reduced fatigue strength exponent.

The invention discloses an acquisition method of a brittleness index of a rock and a rock brittleness evaluation method and relates to the field of brittleness evaluation of the rock. The acquisition method of the brittleness index comprises the following steps: calculating a normalized ratio of yield strain and total strain, a normalized ratio of yield strain and compressive strength, a normalized poisson ratio and a normalized Young modulus according to a resultant stress strain curve of the rock; and determining the brittleness index of the rock according to the normalized ratio of yield strain and total strain, the normalized ratio of yield strain and compressive strength, the normalized poisson ratio and the normalized Young modulus. The brittleness index comprehensively considers elastic and plastic characteristics of the rock and relatively comprehensively considers the whole process of peak-front stage stress-stain of the rock, and the required parameters are easily tested through a mechanical test. The rock brittleness evaluation method disclosed by the invention comprises the step of evaluating the brittleness of the rock by adopting the brittleness index of the rock. The evaluation method of the rock can relatively comprehensively represent the brittleness characteristic of the rock.

Ti-based metal matrix composites, methods of their additive manufacture, and parts manufactured therefrom and thereby are provided. Method include layer-by-layer additive manufacturing for fabricating Ti-based metal matrix composite parts thicker than 0.5 mm, in layers with thickness between 10-1000 micrometers. The parts formed may have one or more of the following properties: a tensile strength greater than 1 GPa, a fracture toughness greater than 40 MPa m1 / 2, a yield strength divided by the density greater than 200 MPa cm3 / g, and a total strain to failure in a tension test greater than 5%.

Components and methods of processing such components from precipitation-strengthened alloys so that the components exhibit desirable grain sizes following a supersolvus heat treatment. The method includes consolidating a powder of the alloy to form a billet having an average grain size. The billet is then forged at a temperature below the solvus temperature to form a forging having an average grain size of not coarser than the grain size of the billet. The billet is then forged at a total strain of at least 5%, after which at least a portion of the forging is heat treated at a temperature below the solvus temperature to pin grains within the portion. The entire forging can then be heat treated at a temperature above the solvus temperature of the alloy without coarsening the grains in the portion.

Split pass forging a workpiece to initiate microstructure refinement comprises press forging a metallic material workpiece in a first forging direction one or more times up to a reduction ductility limit of the metallic material to impart a total strain in the first forging direction sufficient to initiate microstructure refinement; rotating the workpiece; open die press forging the workpiece in a second forging direction one or more times up to the reduction ductility limit to impart a total strain in the second forging direction to initiate microstructure refinement; and repeating rotating and open die press forging in a third and, optionally, one or more additional directions until a total amount of strain to initiate microstructure refinement is imparted in an entire volume of the workpiece.

The invention discloses a high-protein straw feed, which comprises crop straw powder, actinomycetes, nocardia, lactobacillus acidophilusis and bacillus subtilis, the weight ratio of the strains is 0.8-1.2:1.6-2.4:0.8-1.2:1.8-1.2, and the weight ratio of the total strain amount to the crop straw powder is 1:1,000-1,200. The preparation method comprises the following steps of: respectively screening, separating, purifying, rejuvenating and culturing various strains, transplanting the strains into an industrial fermentation tank for fermentation, mixing in a ratio, and adsorbing by using an adsorptive support; and inoculating the obtained composite viable bacteria powder into crop straw powder or a mixture of the crop straw powder, staking and fermenting at the temperature of between 60 and 70 DEG C, uniformly turning once every two days, and obtaining the high-protein straw feed after 30 to 35 days. The high-protein straw feed has the advantages of improving protein content, optimizing protein structure, improving the absorption and nutrient conversion rate of the straw feed, and improving the immunity of livestock.

Methods of refining the grain size of a titanium alloy workpiece include beta annealing the workpiece, cooling the beta annealed workpiece to a temperature below the beta transus temperature of the titanium alloy, and high strain rate multi-axis forging the workpiece. High strain rate multi-axis forging is employed until a total strain of at least 1 is achieved in the titanium alloy workpiece, or until a total strain of at least 1 and up to 3.5 is achieved in the titanium alloy workpiece. The titanium alloy of the workpiece may comprise at least one of grain pinning alloying additions and beta stabilizing content effective to decrease alpha phase precipitation and growth kinetics.

The invention discloses a value obtaining method-comprehensive method of the additional effective damping ratios of energy dissipaters with energy dissipation and shock absorption structures. The method comprises the steps of extracting inter-floor shear force values Fit and inter-floor displacement values uit corresponding to seismic wave moment points after the energy dissipation and shock absorption structures are subjected to finite element elastic-plastic time-history analysis; obtaining total strain energy Wst of the energy dissipation and shock absorption structures at the seismic wave moment points and getting a maximum value max[Wst] of the total strain energy Wst; obtaining the sum Sigma Wcj of dissipative energy of all of energy dissipaters; performing calculation to obtain the additional effective damping ratios 8 a of the energy dissipaters with the energy dissipation and shock absorption structures; assessing whether the additional effective damping ratios 8 a of the energy dissipaters are larger than or equal to additional effective damping ratios set for performance objectives of the energy dissipation and shock absorption structures. In the method, the number and the positions of the energy dissipaters are constantly optimized in the accurate computation result obtaining process, the energy dissipaters are appropriate in selection and arrangement, the economic purpose is achieved while the requirement for dissipating seismic energy to the most extent is met, and the construction cost is reduced.

The invention relates to an online prediction and positioning method for an internal crack of slab continuous casting, and belongs to the technical field of continuous casting. A three-dimensional temperature field of a continuous casting blank is monitored online in real time; the bulging strain of each slicing unit and the total strain of the casting blank at each clamping roller in the monitoring area are calculated in real time according to present real-time casting blank three-dimensional temperature field information, casting equipment parameter information, production process parameterinformation and casting steel type parameter information and by means of a bulging strain model, a bending / straightening strain model and a non-centering strain model; and the critical strain of the casting blank is set according to the casting steel type, when the bulging strain of the slicing unit or the total strain of the casting blank in the monitoring area exceeds the ultra-high critical strain, an internal crack occurs, and the specific position of the internal crack of the casting blank is located. According to the method, the real-time online prediction accuracy for the internal crackof the slab continuous casting can be improved, the occurrence position of the internal crack can be located, then cutting of the casting blank is optimized, the detection time and cost are saved, and the qualified rate of products is increased.