SU676900A1 - Specimen for determining wood cross-breaking strength - Google Patents
Specimen for determining wood cross-breaking strengthInfo
- Publication number
- SU676900A1 SU676900A1 SU752188612A SU2188612A SU676900A1 SU 676900 A1 SU676900 A1 SU 676900A1 SU 752188612 A SU752188612 A SU 752188612A SU 2188612 A SU2188612 A SU 2188612A SU 676900 A1 SU676900 A1 SU 676900A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- determining
- specimen
- load
- breaking strength
- sample
- Prior art date
Links
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
1one
Изобретение относитс к области механических испытаний и предназначено дл использовани в механических лаборатори х , относ щихс к деревообрабатывающей промышленности.The invention relates to the field of mechanical testing and is intended for use in mechanical laboratories related to the woodworking industry.
Известны образцы дл испытани материалов , в том числе и древесины, при статическом изгибе, выполненные в виде призмы квадратного сечени 1.Samples for testing materials, including wood, during static bending, made in the form of a square prism 1 are known.
Однако в процессе испытани таких образцов , особенно влажной древесины, возникают значительные местные деформации в точках приложени нагрззки. Разрущение таких образцов, как правило, происходит в сечени х, проход щих через точки приложени нагрузки.However, in the process of testing such samples, especially wet wood, significant local deformations occur at the points of application of the load. The destruction of such specimens usually occurs in sections passing through the points of application of the load.
Целью изобретени вл етс повышение точности онределени предела прочности древесины при статическом изгибе.The aim of the invention is to improve the accuracy of determining the strength of wood during static bending.
Дл достижени указанной цели образец, состо щий из рабочей, концевых частей и зоны передачи нагрузки, в зонах приложени нагрузки изготовлен с увеличенным по высоте сечением, а переходна зона очерчена по радиусу.To achieve this goal, a sample consisting of working, end parts and a load transfer zone in the areas of application of the load is made with an increased section in height, and the transition zone is outlined along the radius.
На фиг. 1 схематически изображен образец , общий вид; на фиг. 2 - зона приложени нагрузки, узел 1 на фиг. 1.FIG. 1 shows schematically a sample, a general view; in fig. 2 shows the zone of application of the load; node 1 in FIG. one.
Образец имеет рабочую часть /р, концевые части /„, нереходную зону /п и зону S приложени нагрузки. Рабоча и концевые части образца изготовлены в виде призм одинакового квадратного сечени , а зона приложени нагрузки имеет поперечное сечение , превышающее по выеоте рабочую часть на некоторую величину h, нри этом длина зоны приложени нагрузки должнаThe sample has a working part / p, end parts / ", non-transitional zone / p and area S of the applied load. The working and end parts of the sample are made in the form of prisms of the same square cross section, and the load application area has a cross section exceeding in elevation the working part by some value h, however, the length of the load application area
быть не менее 5 мм. Переходна зона очерчена по радиусу R, который подобран таким образом, чтобы исключить концентрацию напр лсений в рабочей чаети образца. При такой форме выполнени образцовbe at least 5 mm. The transition zone is outlined along the radius R, which is chosen in such a way as to exclude the concentration of tensions in the working sample cup. With this form of making samples
разрушение их при испытани х на статический изгиб происходит в средней рабочей части на достаточном удалении от точек приложени нагрузки, т. е. там, где услови деформировани близки к услови мtheir destruction during tests on static bending occurs in the middle working part at a sufficient distance from the points of application of the load, i.e., where the deformation conditions are close to the conditions
чистого изгиба, что и позвол ет повысить точность нри определении предела прочности древесины на статический изгиб.pure bending, which allows to increase the accuracy of determining the strength of wood for static bending.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU752188612A SU676900A1 (en) | 1975-11-05 | 1975-11-05 | Specimen for determining wood cross-breaking strength |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU752188612A SU676900A1 (en) | 1975-11-05 | 1975-11-05 | Specimen for determining wood cross-breaking strength |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU676900A1 true SU676900A1 (en) | 1979-07-30 |
Family
ID=20637014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU752188612A SU676900A1 (en) | 1975-11-05 | 1975-11-05 | Specimen for determining wood cross-breaking strength |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU676900A1 (en) |
-
1975
- 1975-11-05 SU SU752188612A patent/SU676900A1/en active
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