SU918964A1

SU918964A1 - Strength of materials teaching aid

Info

Publication number: SU918964A1
Application number: SU802955355A
Authority: SU
Inventors: Яков Львович Нудельман; Борис Давидович Литовчин
Original assignee: Одесский институт инженеров морского флота
Priority date: 1980-07-11
Filing date: 1980-07-11
Publication date: 1982-04-07

Description

(54) ДЕМОНСТРАЦИОННЫЙ ПРИБОР ПО СОПРОТИВЛЕНИЮ(54) DEMONSTRATION RESISTANCE DEVICE

МАТЕРИАЛОВMATERIALS

Изобретение относитс к учебным приборам и нагл дным пособи м и преЯгНазначено дл изучени и демонстрации устойчивости стержней, сжатых вдоль оси.The invention relates to training devices and in-depth tools and tools designed to study and demonstrate the stability of rods compressed along an axis.

Известен прибор по сопротивлению материа;т ов дл демонстрации устойчивости стержней, состо щий из вертикального шарнтфно закрепленного по концам стержн , съемной промежуточнрй опоры и набора грузов Г1 .A device is known for resistance to materials; it is used to demonstrate the stability of rods, consisting of a vertical pin connected at the ends of the rod, a removable intermediate support and a set of weights G1.

Отсутствие возможности Демонстрировать вли ние степени податливости промежуточной опоры на форму потери устойчивости стержней и величину их критической силы ограничивает диапазон демонстрируемых положений теории .упругой устойчивости.The inability to demonstrate the effect of the degree of compliance of the intermediate support on the form of loss of stability of the rods and the magnitude of their critical force limits the range of demonstrated positions of the theory of elastic stability.

Цель изобретени - расширение диапазона демонстрируемых положений теории .упругой устойчивости.The purpose of the invention is to expand the range of demonstrated provisions of the theory of elastic stability.

Указанна цель достигаетс тем, что в приборе, содержащем вертикапьньй шэ-ргпфио скрепленный концами на штативе стержень, промежуточную опору и набор грузов, промежуточна опора содержит пластинчатую пружину, закрепленную вертикально в основании, три ползуна со стопорами и св зующее звено, причем два ползуна насажены соответственно на вертикальный стержень и пластинчатую пружину и шарнирно соединены со св зующим звеном, а третий ползун установлен на пластинчатой пружине и св зан This goal is achieved by the fact that in a device containing a vertical shee-rgffio a rod, an intermediate support and a set of weights fixed on a tripod to the tripod, the intermediate support contains a plate spring fixed vertically at the base, three slide blocks with stoppers and a link, and two slide blocks are mounted respectively, on the vertical rod and the leaf spring and pivotally connected to the connecting link, and the third slider is mounted on the leaf spring and is connected

0 со стойкой щтатива.0 with a stand shtativa.

На чертеже изображен предлагаемый прибор, общий вид.The drawing shows the proposed device, the overall appearance.

Демонстрационный прибор по сопротивлени1Е (5 материалов содержит вертикальный Demonstration device for resistance1Е (5 materials contain vertical

15 стержень 1, концы которого прикреплены к штативу- 2 и основанию 3 шарнирными опорами 4 и 5. ползуна 6 - 8 с их стопорами 9-11 насажены на вертикальный стержень 1, пластинчатую пружину 15 rod 1, the ends of which are attached to the tripod- 2 and the base 3 by hinged supports 4 and 5. The slide 6 - 8 with their stoppers 9-11 are mounted on a vertical rod 1, a leaf spring

Claims

20 12 and rack tripod 2, respectively. At the same time, two slider 6 and, 7 pivotally middle; to the connecting link 13, and the plate spring 12, the lower end of which is fixed to the base 13, is passed through the opening of the third slider 8. The weights 14 are loosely put on the shank of the support 4. The device works as follows. With the help of the stophs 9-11, the sliders 6-8 are fixed in the positions provided by experience. Putting on the tail. Supports 4 loads 14, bring rod 1 to buckling. As a result of the experiment, the shape of the Defs Matswi rod and its critical force are noted, depending on the magnitude of the compliance of the intermediate support, depending on the position of the slide 8. With a decrease in the value of the flexibility of the intermediate support, when the slide 8 is located near the slide 7, the shape of the loss strength device changes in accordance with with a theoretical investment related to the Bubnov coefficient of compliance. Demonstration of the influence of the intermediate opf along the length of the rod 1 on the magnitude of the critical force is carried out using the same pattern, but when moving the sliders 6 and 7. The proposed demonstration instrument on the resistance of materials facilitates the assimilation by students of the nontrivial provisions of the theory of elastic stability. Shape Invention Formula Demonstration device for the resistance of materials, containing a vertical hinged pin on the rod, intermediate support and a set of weights, characterized in that, in order to extend the range of the demonstrated elastic stability positions, the intermediate support contains a plate spring fixed vertically at the base, three rams with stoppers and a connecting link, with two posed on co-, responsibly on the vertical rod and the leaf spring and pivotally connected with the connecting link, and the third crawler is mounted on a leaf spring and is connected to a stable stand. Sources of information taken into account during the examination 1. USSR author's certificate J 572833, cl. Q09 B 23 / O6, 1978.

I

/four