SU966549A1

SU966549A1 - Method of determining crack resistance of material

Info

Publication number: SU966549A1
Application number: SU813282953A
Authority: SU
Inventors: Виталий Михайлович Кондратенко; Виктор Федорович Сирик; Борис Александрович Кушнир
Original assignee: Днепропетровское Отделение Института Минеральных Ресурсов
Priority date: 1981-03-04
Filing date: 1981-03-04
Publication date: 1982-10-15

Description

Изобретение относитс к испытани м материалов, в частности к способам определени трещиностойкости материала.The invention relates to the testing of materials, in particular, to methods for determining the crack resistance of a material.

Известен способ определени трещиностойкости материала, заключающийс в том, что образец материала в виде диска с надрезом на его торце , выполненным вдоль диаметра, .и наведенной из вершины надреза трещиной нагружают в плоскости диска до разрушени , регистрируют параметры трещинообразовани в образце и по ним суд т о трещиностойкости материала.Надрез нанос т на одном из торцов образца,а нагружение осуществл ют вращением диска в разгонной камере 1.The known method for determining the crack resistance of a material is that a sample of a material in the form of a disk with a notch on its end made along the diameter and induced from the top of the notch by a crack is loaded in the plane of the disk until destruction, the cracking parameters in the sample are recorded and judged The crack resistance of the material. The cut is applied to one of the ends of the specimen, and the loading is carried out by rotating the disc in the accelerating chamber 1.

Недостатком известного способа , вл етс низка точность определени трещиностойкости образцов из горных пород высокой категории буримости из-за сложности закреплени образца в разгонной камере.A disadvantage of the known method is the low accuracy of determining the crack resistance of samples from rocks of the high drillability category due to the difficulty of fixing the sample in the expansion chamber.

Цель изобретени - повышение точности определени трещинос- ойкости материала при испытании образцов горных пород.The purpose of the invention is to improve the accuracy of determining the crack resistance of the material when testing rock samples.

Поставленна цель достигаетс тем, что согласно способу определе ,ни трещиностойкости материала, Заключающемус в том, что образец материала в виде диска с надрезом на его торце, выполненным вдоль диаметра , и наведенной из вершины надреза трещиной нагружают в плоскости диска до разрушени , регистрируют па10 раметры трещинообразовани в образце и по ним суд т о трещиностойкости материала, используют образец с двум симметричными надрезами на обоих торцах, а нагружение образца осу15 ществл ют сжатием вдоль диаметра, совпадающего с надрезами.The goal is achieved by the fact that, according to the method, the crack resistance of the material is determined. The conclusion is that a sample of a material in the form of a disk with a notch on its end made along the diameter, and a fracture induced from the top of the notch is cracked cracking in the specimen and from them judging the crack resistance of the material, use the specimen with two symmetrical cuts on both ends, and loading the specimen is realized by compressing along the diameter coinciding with the specimen Ezami.

Способ осуществл ют следующим образом .The method is carried out as follows.

Из керна горной породы, например From rock core, for example

Claims

20 for a carbonate rock with a diameter of 58 mm, a disk-thickness 29 is cut. On a stone-cutting machine, two symmetric diametrical cuts are made on the disk cutters, cracks are induced from the cuts above the cuts, the specimen is loaded with compression between the plates in its plane along the diameter coinciding with the cuts direction until fracture, the force of the fracture , calculate the fracture stress and determine the crack resistance of the material. The method improves the accuracy of determining the fracture toughness of rocks by creating constrained deformation conditions under loading and simplifying the loading pattern by compressing the sample between the plates. Invention The method for determining the crack resistance of a material consists of a notch disk material made along the diameter, and a crack brought from the top of the notch, load the plane of the disk until fracture, record the cracking parameters in the specimen and determine the crack material strength, characterized in that, in order to improve the determination accuracy when testing rock samples, a sample with two symmetrical cuts is used at both ends, and the sample is loaded by compression along the diameter coinciding with the cuts. F Sources of information taken into account during examination 1. Methodical instructions. Calculations and testing of strength in engineering. Methods of mechanical testing of metals. Characterization of fracture toughness (crack resistance) under static loading. State Standard of the USSR. M., VNIINMASH, 1977, 1 red, 2.3.6, fig.2,4 (prototype).