SU42303A1 - Instrument for drawing along isoclinic curves of trajectories of principal stresses in the optical method of studying stresses in models - Google Patents

Description

The proposed fixture is intended to be used as an auxiliary device when studying the internal stresses by optical methods on models of machine parts made of transparent material, namely when drawing trajectories of main stresses along isoclinic curves, for which each isoclinic curve should be applied to the direction of the main stresses. stress (oj and az) at a certain angle, characteristic only for this isoclinic curve. For each other isoclinic curve, the slope of the main stresses will be different.

In the proposed device for applying the direction of main stresses on isoclinic curves and further building trajectories of main stresses along applied directions, a cruciform stamp is applied, mounted on a spindle, uus under the action of a spring tube, through which a spring needle is pushed, and the tube itself fastened with a divided b disc, pivoted in the slots of the carriage, movable along the rail.

(231)

In FIG. 1 shows the instrument proposed in cross section; and FIG. 2 is a top view.

The proposed device has the following w, th designs. On top of the drawing with already drawn isoclines at a certain height from the latter, there is a possibility to move up and down the rail connecting, I have it, and the two guide bars at their ends, which do not allow the crossbar to warp. The line of a reyshina itself has a slot in its entire length, about 45-50 mm wide. A device consisting of a carriage / (fig. 1, 2), which can be moved along the entire length of the rail, is superimposed on the trough in the slot. The needle / 3 serves to set the device to the desired point from the curve, for which they press the button 14. The spring 15 returns the needle to the raised position, so that it does not fit the drawing apal when moving the rail and the table. Then, the tube 10 is rotated by the head; at the lower end of which, using a locking screw / 5, a cruciform stamp 12 is strengthened. The latter is made of durable metal and its lower edges

sharp. The tube can move up and down in the sleeve 7, which has an attached key 9. The latter fits into the corresponding longitudinal groove in the tube 10, so that if the latter is rotated by the // head, the tube will lead the sleeve 7, which is attached to transparent celluloid disc 6. Ring 8 serves to protect the celluloid from being washed when riveting. The disk 6 runs freely in the corresponding grooves of the carriage /. In addition, the celluloid disk of its circumference has degrees from 0 to 360 °. On the carriage 1, the pointer 17 is fixed. In the upper position, the tube 10 and, consequently, also the stamp 12. Before use, a sheet with printing ink is brought under the stamp and the last one is pressed against the pad by pressing the stamp. After that, removing the paint pad, adjust the disk 6 to the required angle, fix it with screws 2 and lead to the corresponding isoclinic curve. Using needle 13, find a point on the isocline, through which the directions of main stresses want to be drawn, press on the head //, do not lift the needle. Stamp 12 prints its mark on the drawing, which later serves as the direction of the main stresses at a given point. By not changing the direction of the cross, it is only by moving table 1 and the reyschina to find the next point on the same isoclinic curve. Thus, as many crosses are applied on each of the isoclines as they consider the minimum necessary for the correct tracing of trajectories, only the angle of rotation of the disk 6 for each isocline is changed by the corresponding number of degrees.

Subject invention

A device for drawing along isoclinic curves of trajectories of main stresses in the optical method of studying stresses in models, characterized in that, in order to apply the directions of main stresses on isoclinic curves and to further construct trajectories of the main stresses in applied directions, a cruciform shape is used The pin 12, mounted on the tube 10 under the action of the spring 16, through which the spring-loaded needle 13 is passed and which is fastened to the slotted disc 6, swiveled in the slots moving along the slit of the ream of the carriage 1 and serving to set the stamp / 2 at the appropriate angle to the isoclinic curve

Fig1.

Fig2

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Expert and editor A. V. Utkin