CH101435A - Method for fatigue testing of bent rotating bars. - Google Patents
Method for fatigue testing of bent rotating bars.Info
- Publication number
- CH101435A CH101435A CH101435DA CH101435A CH 101435 A CH101435 A CH 101435A CH 101435D A CH101435D A CH 101435DA CH 101435 A CH101435 A CH 101435A
- Authority
- CH
- Switzerland
- Prior art keywords
- cross
- machine
- offset
- axes
- sectional
- Prior art date
Links
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
- G01N3/34—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by mechanical means, e.g. hammer blows
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0026—Combination of several types of applied forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0026—Combination of several types of applied forces
- G01N2203/0028—Rotation and bending
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0073—Fatigue
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
Verfahren zur Ermiidungsprüfung von durchgebogen rotierenden Stäben. Martens hat ein Verfahren angegeben, um Stäbe auf Ermüdung des Materials zu prüfen, indem er sie in durchgebogenem Zustande um ihre gebogene Achse rotieren liess. Der Stab a ruht dabei gemäss Fig. 1 in zwei festen Kugel lagern b, während am äusseren Laufring zweier weiterer Kugellager c die Belastungsgewichte d angehängt sind.
Will man nun Stäbe mit unsymmetrischem Querschnitt auf rotierende Biegung prüfen, so treten infolge der ungleichen Durchbiegung in den beiden Querschnittsachsen erhebliche Schwingungen der Belastungsstellen c d auf, die durch ihre Massenwirkungen die Genauig keit des Versuches bis zur Unbrauchbarkeit ungünstig beeinflussen.
Nach der Erfindung werden diese Schwin gungen wesentlich vermindert dadurch, dass man etatt eines Probestabes mindestens zwei gleiche Probestäbe in die Maschine einlegt und ihre Querschnittsachsen gegeneinander im Winkel verdreht.
Gemäss Fig. 2 sind zwei gleiche Profil stäbe e und f so hintereinander montiert, dass die erste Hauptachse des einen in der gleichen achsialen Ebene liegt wie die zweite Hauptachse des andern. Der Winkel, den die Rotationsachsen der beiden Lagerzapfen g und lt miteinander einschliessen, ist konstant, er ändert aber seine Lage im Laufe der Drehung. Die Lage der belastenden Gewichte d bleibt dauernd unverändert, falls passende Zugfedern zwischen Gewicht und Aufhänge stellen eingeschaltet werden.
Gemäss Fig. 3 sind die beiden Profilstücke e und f wiederum um 90 gegeneinander ver dreht, aber nunmehr einander parallel zwischen je zwei Paaren von Lagerzapfen g g, 1a h ein gespannt, deren feste Lager b und deren be wegliche Lager c auf jeder Maschinenseite jeweils 'starr miteinander verbunden sind. Die Einspannung ist so gewählt, dass die Profil stücke immer nur um ihre schwächere Haupt achse gebogen werden, während sie in der um 90 verdrehten Stellung spannungsfrei sind.
Die Stabenden sind zu diesem Zweck in Gelenkköpfen i eingespannt, durch die das Biegungsmoment abwechselnd bald auf die eine, bald auf die andere Probe übertragen wird, falls diese mit gleicher Geschwindigkeit und unter Beibehaltung ihrer anfänglichen relativen Verdrehung rotieren. Bei dieser Altordnung bleibt die Lage der Gewichte dauernd die nämliche, was die Anwendung grösserer Tourenzahlen als bei der Anordnung nach Fig. 1 gestattet.
Procedure for the failure test of bent rotating bars. Martens has specified a method to test bars for fatigue in the material by allowing them to rotate around their bent axis in a bent state. The rod a rests according to FIG. 1 in two fixed ball bearings b, while the load weights d are attached to the outer race of two further ball bearings c.
If you want to test bars with an asymmetrical cross-section for rotating bending, the unequal deflection in the two cross-sectional axes causes considerable vibrations in the load points c d, which, through their mass effects, adversely affect the accuracy of the test until it is unusable.
According to the invention, these vibrations are significantly reduced by inserting at least two identical test bars into the machine instead of a test bar and twisting their cross-sectional axes at an angle to one another.
According to FIG. 2, two identical profile rods e and f are mounted one behind the other so that the first main axis of one lies in the same axial plane as the second main axis of the other. The angle that the axes of rotation of the two bearing journals g and lt include with one another is constant, but it changes its position in the course of rotation. The position of the onerous weights d remains unchanged if suitable tension springs are switched on between the weight and the suspension points.
According to Fig. 3, the two profile pieces e and f are again rotated by 90 against each other, but now parallel to each other between two pairs of bearing journals gg, 1a h clamped, their fixed bearing b and their moving bearing c on each side of the machine each ' are rigidly connected to each other. The clamping is chosen so that the profile pieces are only bent around their weaker main axis, while they are free of tension in the position rotated by 90.
For this purpose, the rod ends are clamped in joint heads i, through which the bending moment is alternately transmitted now to one specimen and now to the other specimen if they rotate at the same speed and while maintaining their initial relative rotation. In this old arrangement, the position of the weights remains the same, which allows the use of greater numbers of revolutions than in the arrangement according to FIG.
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH101435T | 1922-08-18 |
Publications (1)
Publication Number | Publication Date |
---|---|
CH101435A true CH101435A (en) | 1923-09-17 |
Family
ID=4359839
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH101435D CH101435A (en) | 1922-08-18 | 1922-08-18 | Method for fatigue testing of bent rotating bars. |
Country Status (1)
Country | Link |
---|---|
CH (1) | CH101435A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3170321A (en) * | 1960-01-05 | 1965-02-23 | Vincent E Sullivan | Fatigue testing machine |
US3324714A (en) * | 1965-03-10 | 1967-06-13 | Albert B Simon | Flexure stiffness testing machine for ultra-thin sheets |
US5231882A (en) * | 1991-02-16 | 1993-08-03 | Telefunken Systemtechnik Gmbh | Testing device for performing four-point fatigue strength tests under alternating bending stresses |
WO1995002810A1 (en) * | 1993-07-15 | 1995-01-26 | Industrieanlagen-Betriebsgesellschaft Mbh | Rotating bending testing machine for long round rods |
-
1922
- 1922-08-18 CH CH101435D patent/CH101435A/en unknown
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3170321A (en) * | 1960-01-05 | 1965-02-23 | Vincent E Sullivan | Fatigue testing machine |
US3324714A (en) * | 1965-03-10 | 1967-06-13 | Albert B Simon | Flexure stiffness testing machine for ultra-thin sheets |
US5231882A (en) * | 1991-02-16 | 1993-08-03 | Telefunken Systemtechnik Gmbh | Testing device for performing four-point fatigue strength tests under alternating bending stresses |
WO1995002810A1 (en) * | 1993-07-15 | 1995-01-26 | Industrieanlagen-Betriebsgesellschaft Mbh | Rotating bending testing machine for long round rods |
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