13 results about "Drop weight" patented technology

A molded article of a composite resin containing fibers includes a base resin 1 and a fibrous filler 2 having fibrillated ends in a fiber length direction. An expression Ho×0.4≤H≤Ho is satisfied where H is a maximum height for an unbroken first plate-like test piece having a thickness of 1 to 2 mm after the test piece is kept at −10° C. for three hours and then is hit by a dropped weight of 250 g; and Ho is as same maximum height for the unbroken second plate-like test piece only made of the base resin with a thickness of 1 to 2 mm as for the first plate-like test piece. An expression So×0.4≤S≤So is satisfied where S is a Charpy impact strength (JIS K 7111) of the molded article, and So is a Charpy impact strength of the molded article only made of the base resin.

The invention discloses a calculation method for coupling of the number of main umbrellas and a resistance coefficient of a reloading air-drop system. According to a large number of test results, the resistance coefficient of the group parachutes is inversely calculated according to the air-drop falling speed, the air-drop weight, the landing field density and the number of the main parachutes in the air-drop test, and the relation between the resistance coefficient and the number of the main parachutes is obtained. The area of a single parachute is selected according to the air-drop weight and the air-drop landing field, when the air-drop weight is larger than 1 ton, the method is suitable for selecting a main parachute of 760 square meters, and when the air-drop weight is smaller than 1 ton, the method is not suitable. Setting an initial landing speed and an initial resistance coefficient, and calculating the number of main umbrellas according to a formula. If the air-drop weight, the landing speed and the landing field change, the number of the main parachutes can be calculated again according to the steps. The method can solve the problem of selection of the number of the main umbrellas during air-drop of the reloading air-drop system.

The invention discloses an anti-collision pressure vessel steel with yield strength of 790 MPa and a production method thereof. The anti-collision pressure vessel steel comprises the following components in percentage by weight: 0.130 to 0.185 percent of C, 0.28 to 0.63 percent of Si, 1.45 to 1.88 percent of Mn, 0.020 to 0.047 percent of Al, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.025 to 0.050 percent of Nb, 0.035 to 0.065 percent of V, 0.30 to 0.50 percent of Cr, 0.25 to 0.52 percent of Mo and the balance of Fe and inevitable impurities. 0.37 < = (Nb + V) / C < = 0.62, 0.50 < = Nb / V < = 1.43, 3.72 < = (Cr + Mo) / C < = 5.60, 330 < = Mn / S < = 1630, and 2.40 < = Mn / (C + Si) < = 3.60. According to the steel for the pressure vessel, the static yield strength ReL ranges from 815 MPa to 890 MPa, the dynamic yield strength Re ranges from 895 MPa to 1260 MPa, the static tensile strength ranges from 870 MPa to 960 MPa, the static percentage elongation after fracture A ranges from 19% to 24%, the dynamic percentage elongation after fracture Ad ranges from 18.5% to 22.5%, and the product of strength and ductility ranges from 18250 MPa.% to 22420 MPa. The drop weight tear (DWTT) energy ranges from 23.5 kJ to 27.8 kJ; when the collision speed is 6-50 m / s, the collision displacement is 1.5 m and the strain rate range is 0.03-16 1 / s, the absorption energy of the steel plate after collision is 4.17-4.73 KJ, and the performance requirements that the static steel plate does not generate large deformation and does not generate steel plate fracture during collision energy absorption are met.

Field test device for determining the dynamic modulus of elasticity of asphalt, comprising a loading device (1) consisting of a guide rod (4) with a notching device (5) attached thereto, a drop weight (8), a spring element (7) and a mounting cap (6), and a loading plunger (2) having a plunger surface (14) and a substantially cylindrical plunger shaft (9) having the plunger surface (14) on one end face and a plunger head (10) on the other end face, wherein the plunger shaft (9) is movably arranged in a guide element (3) in the longitudinal direction of the plunger shaft (9) and the guide element (3) has a bearing surface (18) with a through-opening (16) that can be placed on an asphalt surface (24), the plunger shaft (9) extends through this through-opening (16) such that the plunger surface (14) rests on the asphalt surface (24),the stamp head (10) has a mounting plate (11) for the force-fit coupling of the loading device (1) and an acceleration sensor (12) for detecting the time course of the acceleration of the loading stamp (2) and a displacement sensor (19) for detecting the movement of the loading stamp (2) are arranged on the guide element (3).

The invention discloses an anti-collision pressure vessel steel with yield strength of 355MPa and a production method thereof. The anti-collision pressure vessel steel comprises the following components in percentage by weight: 0.06-0.13% of C, 0.15-0.40% of Si, 1.10-1.50% of Mn, 0.025-0.045% of Al, less than or equal to 0.015% of P, less than or equal to 0.005% of S, 0.010-0.020% of Nb and the balance of Fe and inevitable impurities. 0.085 < = Nb / C < = 0.28, 230 < = Mn / S < = 1490, and 2.74 < = Mn / (C + Si) < = 4.74. According to the steel for the pressure vessel, the static yield strength ReL ranges from 380 MPa to 490 MPa, the dynamic yield strength Re ranges from 470 MPa to 685 MPa, the tensile strength ranges from 490 MPa to 630 MPa, the static percentage elongation after fracture A ranges from 22% to 26%, the dynamic percentage elongation after fracture Ad ranges from 20% to 25%, and the product of strength and elongation ranges from 13100 MPa.% to 15000 MPa. The drop weight tear (DWTT) energy is 15 to 19 kJ; when the collision speed is 6-50 m / s, the collision displacement is 1.5 m, and the strain rate is 0.028-161 / s, the absorption energy of the steel plate after collision is 2.58-3.35 KJ, and the performance requirements that the steel plate does not generate large deformation and does not generate steel plate fracture during collision energy absorption are met.

This invention relates to the technical field of engineering experimental equipment and discloses a drop hammer impact testing machine for testing the impact resistance of drainage pipes. To solve the problem of local deceleration due to friction during the downward movement of the experimental hammer, an inner hammer and an experimental hammer are installed on a platform. Both the inner hammer and the experimental hammer descend synchronously under their own weight. During the downward movement of the platform, it moves directionally downward along the emergency stop guide rod and the one-way limiting guide rod. According to the law of free fall, if the resistance between the platform and the emergency stop guide rod and the one-way limiting guide rod causes the downward speed of the platform to decrease, the inner hammer will continue to descend under its own weight, and the movement restriction on the detection push rod will be released. The locking frame finally abuts against the limiting tooth row on the outer side of the one-way limiting guide rod through the locking push rod, thereby obstructing the downward movement of the platform and preventing it from impacting the drainage pipe again after deceleration. Ultimately, the downward speed of the experimental hammer and the inner hammer can be compared in real time.

This invention discloses a low-cost, high-performance L450M pipeline steel hot-rolled coil and its manufacturing method. The chemical composition (Wt%) of the hot-rolled coil is: C 0.05~0.08, Si 0.15~0.30, Mn 1.35~1.85, P≤0.013, S≤0.005, Nb 0.035~0.045, Ti 0.009~0.018, Cr 0.10~0.18, Als 0.015~0.055, Mg 0.0008~0.0032, Ca 0.0005~0.0020, N≤0.005, Ca / Mg 0.3~1. This invention adopts a C-Mn-Nb-Mg-Ca design, combined with rolling and cooling processes, to produce a coil with a R... t0.5 490~590MPa, R m 550~700MPa, A 50 ≥30%, Average impact energy A at -40℃ kv ≥300J, -20℃ drop weight DWTT average ≥90%, hardness value HV 10 ≤210, yield strength ratio not higher than 0.78. This invention solves the problems of existing rolling processes being relatively complex, having multiple rolling passes and high costs, and having relatively lenient low-temperature toughness indicators for products.

The application discloses an anti-collision pressure container steel for storing and transporting ethane, which is characterized by the following components and wt%: C: 0.10-0.20%, Si: 0.20-0.40%, Mn: 1.58-1.80%, Al: 0.025-0.045%, P: ≤0.015%, S: ≤0.005%, V: 0.030-0.065%, and Nb: 0.025-0.045%. The application comprises the following steps: after smelting and casting into a blank, the cast blank is heated; rough rolling; finish rolling; cooling; normalizing; and stress relief. The static yield strength Rel of the steel is 420-480 MPa, the dynamic yield strength Re is 510-747 MPa, the tensile strength is 585-645 MPa, the yield strength ratio is ≤0.85, the static elongation after fracture A is 28-42%, the dynamic elongation after fracture A d The steel plate has the following properties: the static yield strength Rel is 420-480 MPa, the dynamic yield strength Re is 510-747 MPa, and the tensile strength is 585-645 MPa; the yield strength ratio is ≤0.85, the static elongation after fracture A is 27-40%, the dynamic elongation after fracture A is 27-40%, the product of strength and plasticity is 16800-26042 MPa%, the drop weight tear test (DWTT) energy is 15-19 kJ, the absorbed energy of the steel plate is 3.5-3.75 KJ when the collision speed is 5-50 m / s and the collision displacement is 1.5 m, and the ferrite grain size is ≤0.012 μm.

The invention discloses steel with yield strength of 500MPa for an anti-collision pressure vessel and a production method of the steel. The steel comprises the following components in percentage by weight: 0.09 to 0.185 percent of C, 0.18 to 0.50 percent of Si, 1.33 to 1.80 percent of Mn, 0.025 to 0.045 percent of Al, less than or equal to 0.015 percent of P, less than or equal to 0.005 percent of S, 0.010 to 0.025 percent of Nb, 0.09 to 0.26 percent of Cr, 0.10 to 0.25 percent of Mo and the balance of Fe and inevitable impurities. Nb / C is greater than or equal to 0.069 and less than or equal to 0.28, (Cr + Mo) / C is greater than or equal to 1.50 and less than or equal to 5.12, Mn / (C + Si) is greater than or equal to 2.50 and less than or equal to 3.97, and Mn / S is greater than or equal to 440 and less than or equal to 1690. According to the steel for the pressure vessel, the static yield strength ReL ranges from 500 MPa to 770 MPa, the dynamic yield strength Re ranges from 630 MPa to 965 MPa, the static tensile strength ranges from 640 MPa to 780 MPa, the static percentage elongation after fracture A ranges from 21% to 26%, the dynamic percentage elongation after fracture Ad ranges from 17.5% to 24.5%, and the product of strength and elongation ranges from 14500 MPa.% to 17580 MPa. The drop weight tear (DWTT) energy ranges from 16.7 kJ to 22.1 kJ; when the collision speed is 6-50 m / s, the collision displacement is 1.5 m and the strain rate is 0.028-19 / s, the absorption energy of the steel plate after collision is 3.58-4.15 KJ, and the performance requirements that the steel plate does not generate large deformation and does not generate steel plate fracture during collision energy absorption are met.

This invention discloses a method, apparatus, and storage medium for calculating the bearing capacity of coral sand vibratory compaction foundations. The calculation method includes: determining the initial void ratio of the original coral sand on-site; performing multi-stage vibratory compaction on the foundation; testing the void ratio and effective reinforcement depth of the coral sand after vibratory compaction based on the energy of each stage of compaction; determining the energy dissipation coefficient of coral sand particle breakage through drop weight tests; establishing a formula for calculating the ultimate bearing capacity of coral sand to calculate the bearing capacity; and adjusting reinforcement parameters or optimizing load distribution. This calculation method couples the void ratio and particle breakage energy dissipation of coral sand to the bearing capacity calculation formula. On-site load plate measurements show that the bearing capacity calculation results after incorporating the characteristics of coral sand have small errors compared with on-site verification, meeting engineering design requirements and can be directly used in the reinforcement design calculation of coral sand foundations, significantly reducing the deviation of traditional design calculation results. In addition, this method is highly operable, economical, and computationally efficient, making it suitable for deep-sea island and reef engineering design applications.

The application discloses a method for reducing mechanical property anisotropy of pipeline steel, the pipeline steel and application thereof, and belongs to the technical field of pipeline steel production. The method for reducing mechanical property anisotropy of pipeline steel is to reduce the content of {001} <110> texture in the pipeline steel, reduce the density of {001} cleavage surface, and obtain the pipeline steel with low anisotropy by controlling the production process of the pipeline steel. The pipeline steel is of X80 grade, the microstructure is acicular ferrite, the texture is mainly {112} <110>, {554} <225>, {332} <113> texture and {110} slip surface; the tensile strength is 650-710 MPa, the -20 DEG C drop weight shear area ratio is 90%-100%, the difference between the anisotropy is not higher than 30 MPa, and the difference between the anisotropy of the drop weight shear area ratio is not higher than 10%. The method can effectively solve the problem of the performance anisotropy of the existing pipeline steel.

The present application relates to the technical field of material mechanics testing, and more particularly to a method for evaluating the fracture of an NDT drop hammer sample, comprising: performing penetration detection on the NDT drop hammer sample; evaluating whether the sample is fractured according to the penetration detection result; if the penetration detection result shows that the crack has extended to the edge of the tensile surface of the sample, the sample is determined to be fractured; if the penetration detection result shows that the crack has not extended to the edge of any tensile surface, the sample is determined to be unfractured. The present application has the following advantages: the penetration detection technology is introduced to display the surface cracks of the controversial sample, and the determination is made according to whether the cracks have extended to the edge of the tensile surface of the sample; the penetration detection can clearly display the micron-level surface opening cracks, the detection result is presented in the form of an intuitive color linear trace, and the determination differences caused by visual differences and different experiences of different operators are avoided; and the present application can provide a basis for determining whether the controversial sample with obvious plastic deformation and indentation is cracked.

The application discloses an anti-collision pressure container steel for storing and transporting trifluoromethane, which is characterized by the following components and wt%: C: 0.10-0.20%, Si: 0.15-0.40%, Mn: 0.70-1.15%, Al: 0.015-0.025%, P: ≤0.015%, S: ≤0.005%, V: 0.015-0.035%, and Nb: 0.010-0.022%. The application comprises the following steps: after smelting and casting into a blank, the cast blank is heated; rough rolling; finish rolling; cooling; normalizing; and stress relief. The static yield strength Rel of the application is 245-350 MPa, the dynamic yield strength Re is 315-555.5 MPa, the tensile strength is 400-520 MPa, the yield strength ratio is ≤0.85, the static elongation after fracture A is 31-41%, the dynamic elongation after fracture A is 30-40%, the product of strength and plasticity is 13950-21320 MPa%, the drop weight tear test (DWTT) energy is 19-21 kJ, the absorbed energy of the steel plate is 2.5-3.1 KJ when the collision speed is 5-50 m / s and the collision displacement is 1.5 m, and the grain size of ferrite is not more than 0.035 μm. d The application discloses an anti-collision pressure container steel for storing and transporting trifluoromethane, which is characterized by the following components and wt%: C: 0.10-0.20%, Si: 0.15-0.40%, Mn: 0.70-1.15%, Al: 0.015-0.025%, P: ≤0.015%, S: ≤0.005%, V: 0.015-0.035%, and Nb: 0.010-0.022%. The application comprises thefollowing steps: after smelting and casting into a blank, the cast blank is heated; roughrolling; finish rolling; cooling; normalizing; and stress relief. The static yield strength Rel ofthe application is 245-350 MPa, the dynamic yield strength Re is 315-555