Residual stress field measuring device of spherical shell part and modeling method
A measurement device, stress field technology, applied in special data processing applications, material analysis using radiation diffraction, geometric CAD, etc., to achieve the effect of strong engineering practical value
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Embodiment 1
[0072] This embodiment provides a residual stress field measurement device for spherical shell parts, such as figure 1 As shown, the measuring device of this embodiment is mainly composed of theodolite and stable platform. Among them, the theodolite is used to fix the spherical shell, control the motion trajectory and spatial position accuracy of the spherical shell during the measurement process, and output the spatial coordinate information of the measurement micro-area at the same time; the stable platform is used to stabilize the parts and mechanisms to ensure the isolation of the outside world during the measurement process. interference.
[0073] Wherein, the theodolite of the present embodiment mainly includes the following mechanisms: a part fixing platform 2 , a longitude meter 3 , a latitude meter 4 , a two-axis adjustable support 5 and an azimuth 6 . Such as figure 2 shown.
[0074] Parts fixing platform 2, equipped with mechanical level and electronic level. T...
Embodiment 2
[0084] Based on the measurement device proposed in the above-mentioned embodiment 1, this embodiment provides a method for modeling the residual stress field of thin-walled spherical shell parts, such as Figure 4 A typical under-height thin-walled spherical shell part shown (for convenience of description, this embodiment is referred to as a spherical shell), that is, the height of the spherical shell is smaller than the radius, and the center O is located outside the part. A measurement micro-area plane 13 at any position on the outer surface of the spherical shell, its side length satisfies a<<R, where a is the side length of the measurement micro-area plane 13, R is the radius of the outer circle of the spherical shell, and O is the center of the spherical shell .
[0085] The specific process of the modeling method in this embodiment is as follows:
[0086] Step 1: Determine the type of the spherical shell, clamp the parts, align the center axis of rotation of the spheri...
Embodiment 3
[0140] For the measuring device and modeling method proposed in the above-mentioned embodiment 1 and embodiment 2, applicable parts mainly include two main configurations:
[0141] 1) Thin-walled spherical shell type configuration, including hemispherical shell 32 (h=r), under-elevated spherical shell 33 (hr). The measurement steps of this type of spherical shell configuration are basically the same: aligning the center of the spherical shell with the center axis of rotation of the longitude meter, and aligning the center of the spherical shell with the pitch axis of the latitude meter.
[0142] The key steps to pay attention to for the longitudinal eccentric spherical shells (35 and 36) are: adjust the height of the pitch axis of the latitude instrument so that the pitch axis passes through the spherical center O of the spherical shell, so as to ensure that the plane of the measured micro-area is always tangent to the spherical surface, and the micro-area The normal vector of...
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