A Method for Measuring the Impact Load of Double Symmetrical Sections of Beams
A measurement method, technology of impact load, applied in the direction of testing the strength of materials, measuring devices, instruments, etc. by using a single impact force
Active Publication Date: 2020-05-08
JIANGXI HONGDU AVIATION IND GRP
View PDF5 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0009] The purpose of the present invention is to provide a method for measuring the impact load of a double symmetrical section of a beam to solve the problem of load measurement when the beam is subjected to high-speed impact in the actual working state
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0030] The present invention is described in detail below in conjunction with accompanying drawing:
[0031] For the bisymmetric section of the selected structural beam, establish the beam element coordinate system, the origin of the coordinate system is selected at the centroid O point of the section, the x and y axes are respectively the two symmetry axes of the section, and the z axis is along the direction of the beam. figure 1 shown.
[0032] in the attached figure 2 The first patch 1, the second patch 2, the third patch 3, and the fourth patch 4 shown in the cross-section are pasted with right-angle rosette strain gauges, and the direction of sticking the right-angle rosettes is defined in the appendix image 3 , 4 , 5, and 6. Select a right-angled side of the right-angled flower in the original +z-axis direction, and set it as εi_0°, which is εi in the beam element coordinate system z ; εi_90° along the section direction, εi in beam element coordinates x or εi y ...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
Login to View More Abstract
The invention relates to a method for measuring disymmetrical section impact load of a beam and belongs to the field of measurement of load of an airplane design mechanical structure. The method comprises the following steps: A) determining a section, needing to be measured, of a structural beam, wherein the section must be a disymmetrical section; B) on the determined disymmetrical section, selecting the surface, which two symmetrical shafts pass through, of a test sample and sticking right-angled strain flower sheets to the surface; C) measuring the strain values of four flower sheets underthe actual working state; D) obtaining the elastic modulus E and the Poisson's ratio of the structural beam material by aiming at the common round section and the ring section, and calculating the section load by utilizing the corresponding formula; and E) for the common disymmetrical section, enabling the method to be consistent with the round or ring section calculation method except for the torque load of the section, calibrating the torque load of the section, and backstepping the section load by calibrating the relation between the load and the strain.
Description
technical field [0001] The invention relates to a method for measuring the impact load of a double symmetrical section of a beam, which belongs to the field of load measurement of aircraft design mechanical structures. Background technique [0002] In mechanical structures, many structures can be assumed to be beams, such as automobile frames, aircraft arresting hooks, and engine piston rods, based on the plane assumption and the assumption that longitudinal fibers have no normal stress. These structural beams are easily damaged when subjected to high-speed impact. If the impact load during structural work can be measured, the load can be used to optimize the design and improve the force transmission path, thereby reducing the accident rate. [0003] Beam loading refers to the axial force, shear force and bending moment of a section. Usually an Euler coordinate system is established and decomposed into forces in three directions and bending moments in three directions. [...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/30
CPCG01N3/30G01N2203/001G01N2203/0075
Inventor 黄瑞泉王进剑龙思海张海东廖文峰石飞罗金亮沈文静彭志军朱亲强滕春明李朝光项小平叶彬
Owner JIANGXI HONGDU AVIATION IND GRP