SU1310680A1 - Method of strength testing of ice - Google Patents

Abstract

The invention can be used to determine the strength characteristics of ice in laboratory and field conditions. The purpose of the invention is to simplify and increase reliability by approximating test conditions to real ones. The metal vessel 1 is filled with a freezing working fluid up to the wall 2 with an opening 3. At a negative ambient temperature, an ice layer 9 is formed, which is used as a test specimen. Then, the pressure of the non-frozen liquid in the vessel 1 is increased, and the fracture pressure of the ice layer 9 is measured. 2 Il. (L C th f 00 05 CX)

Description

t13

The invention relates to a testing technique and can be used to determine the strength characteristics of ice in laboratory and field conditions.

The aim of the invention is to simplify and increase the reliability by approximating the test conditions to natural,

Figure 1 presents a device that implements the method; FIG. 2 is a section A-A in FIG. I,

The device consists of a cylindrical metal vessel 1 divided by a wall 2 with a round hole 3 into two containers 4 and 5. A container 5 equipped with a tube 6 with a valve 7 on the inner end and with a cap nut 8 on the outer end is filled with a working fluid, for example water Nut cap 8 and pipe 6 are made of thermal insulating material that provides protection against freezing of valve 7 when the surface layer of the working fluid is frozen. The container 4 with the lid 10 serves to receive fragments at the time of the destruction of the test layer 9 of ice. The outer surface of the vessel 1 is covered with a heat insulating layer. The method for testing the strength of ice is as follows.

Liquid 5 is poured into a container 5 with a nut-cap 8 of the vessel 1 up to a circular opening 3 in the wall 2. A layer of ice 9 is formed at a negative temperature after a certain time. The freezing time of the ice layer 9 in the round hole 3 of the wall 2 in the vessel 1 without the lid 10 is determined by the formula

g 790 h / 9,

where t is the freezing time;

h is the layer thickness, cm;

9 — ambient temperature, ° C. After the layer 9 of ice is frozen, the pressure and measurement systems are attached to the outer end of the tube 8. Vessel 1

06802

the lid 10 is closed. When the liquid is supplied under pressure through the tube 5, the ice layer 9 is destroyed, the load P is measured (in kg), the strength of the layer 9 is calculated

5 ice bending (6, kg / cm) in the center

6, 0.49 P (-1- f

and the contour

2 0.75 P (-) S

and 6 2 /

where g is the radius of the hole 3 in the wall 2 cm;

h is the thickness of layer 9 of ice, cm; - Poisson's ratio, If necessary, determine the ice breakdown f (cm) and modulus of elasticity

0.17 Pr

h f

E

35

The proposed method provides an increase in the reliability of tests, since it allows simulating ice cover in reproducible conditions of freezing,

Claims (1)

JQ claims A method of testing the strength of ice, which consists of making a flat sample of ice, loading it around the area of a circular contour by filling the vessel with a circular hole in the wall in which the sample is placed with working fluid and creating pressure of the liquid in , Q vessel, the destruction pressure of the sample is measured and judged on the strength characteristics of ice, characterized in that, in order to simplify and increase the reliability of the PU, f by approximating the test conditions to full-scale ones, the vessel is filled before the sample is manufactured, and it is carried out by freezing the surface layer of the working fluid in contact with 50 the wall of the round opening of the vessel. (cg.2 Editor K. Voloshchuk Compiled by E, Grabov Techred.A. KravchukKorrektor M.Pogo Order 1882/38 Circulation 777 Subscription VNIIPI USSR State Committee on affairs of inventions and Otk1M 1ti 113035, Moscow, Zh-35, Raushsk nab., d.4 / 5 Production and printing company, Uzhgorod, Projecto st., 4