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 two parts, the theodolite and the 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; the stable platform is used to stabilize parts and mechanisms to ensure isolation from the outside world during the measurement process. interference.
[0073] The theodolite in this embodiment mainly includes the following mechanisms: a part fixing platform 2 , a longitude meter 3 , a latitude meter 4 , a two-axis adjustable bracket 5 and an azimuth device 6 . like figure 2 shown.
[0074] Parts fixing platform 2, equipped with mechanical level and electronic level. The function of t...
Embodiment 2
[0084] Based on the measurement device proposed in the above embodiment 1, this embodiment provides a residual stress field modeling method for thin-walled spherical shell parts, such as Figure 4 A typical low-height thin-walled spherical shell part shown (for ease of description, this embodiment is referred to as spherical shell), that is, the spherical shell height is smaller than the radius, and the spherical 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 outer radius of the spherical shell, and O is the spherical center of the spherical shell .
[0085] The specific process of the modeling method of this embodiment is as follows:
[0086] Step 1: Determine the type of the spherical shell, clamp the parts, align the rotation center axis of the spherical shell 1 and the longitude me...
Embodiment 3
[0140] The measuring devices and modeling methods proposed in the above-mentioned Embodiments 1 and 2 mainly include two main configurations:
[0141] 1) Thin-walled spherical shell configuration, including hemispherical shell 32 (h=r), less high spherical shell 33 (hr). The measurement steps of this kind of spherical shell configuration are basically the same: align the spherical center of the spherical shell with the rotation center axis of the longitude meter, and align the spherical shell center with the pitch axis of the latitude meter.
[0142] The key steps to pay attention to for the longitudinally 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 measurement micro-area plane is always tangent to the spherical surface, and the The normal vector of the area plane passes through the sphere center O, which s...
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