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Helical springs

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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001596
EISBN: 978-1-62708-225-9
... Abstract During testing of compressors under start/stop conditions, several helical suspension springs failed. The ensuing failure investigation showed that the springs failed due to fatigue. The analysis showed that during start/stop testing the springs would undergo both a lateral and axial...
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Published: 01 June 2019
Fig. 10 Modified Goodman Diagram for 1.5 mm music wire helical springs at 10 7 , 10 5 , and 10 4 cycles. All the stresses were corrected by the Wahl factor. The values at R=0 were obtained from Ref 10 . The data points 373 and 231 represent the fatigue loading for 9 mm and 5 mm displacement More
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Published: 01 June 2019
Fig. 15 Typical Ring-down pattern for helical springs following the compressor stopping. Distributions were determined for each of the first seven oscillations in both directions by recording six events. The table shows the mean values of the distributions. More
Series: ASM Failure Analysis Case Histories
Volume: 1
Publisher: ASM International
Published: 01 December 1992
DOI: 10.31399/asm.fach.v01.c9001119
EISBN: 978-1-62708-214-3
... Abstract To samples of helical compression springs were returned to the manufacturer after failing in service well short of the component design life. Spring design specifications required conformance to SAE J157, “Oil Tempered Chromium Silicon Alloy Steel Wire and Springs.” Each spring...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c9001220
EISBN: 978-1-62708-225-9
... Abstract A helical compression spring with ten turns made of 1.8 mm thick wire which was under high pressure during tension applied to a rocker arm broke on the test stand in the third turn. The fracture was a torsion fracture that initiated in the highly loaded inner fiber and showed in its...
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Published: 01 June 2019
Fig. 1 Helical spring that failed by fatigue. Weld spatter (arrows) was believed to have caused the failure (see text). Arrow FO indicates fracture origin. 29x More
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Published: 01 June 2019
Fig. 5 (a) Schematic of axially loaded helical spring. (b) Free body diagram showing that the wire is subject to a direct shear and a torsional shear 6 More
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Published: 01 January 2002
Fig. 17 Torsional fatigue failure of boron-containing alloy steel helical spring. Fatigue initiated at an abraded area marked by arrows. The material in compression coil springs is subjected to unidirectional torsion, so fatigue propagates on a single helical surface. Source: Ref 4 More
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Published: 01 January 2002
Fig. 16 Linear helical spring parameters More
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Published: 30 August 2021
Fig. 9 A fracture surface (left) on a helical spring More
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Published: 30 August 2021
Fig. 10 A fatigue crack on a second helical spring at a similar location as shown in Fig. 9 More
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.mech.c0048139
EISBN: 978-1-62708-225-9
... Abstract The conical helical spring sealed, within each switch enclosure, fractured to lead to the failure of several electrical toggle switches. The spring was fabricated from 0.43 mm diam AISI type 302 stainless steel wires. Appreciable amount of scale was observed on the fracture surface...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0048154
EISBN: 978-1-62708-235-8
... Abstract A medium-carbon helical spring was installed in a machine assembly that was welded into its final location. Weld spatter was not prevented from landing on the wire surface by any shield. An elongated drop and two tiny droplets of metal were observed a short distance from the fracture...
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Published: 01 June 2019
Fig. 7 Ratio of lateral to axial stiffness for helical compression springs as a function of the ratio of working height to mean coil diameter and the ratio of static deflection to working height 9 More
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Published: 01 June 2019
Fig. 14 Process block diagram for fatigue model used to simulate the fatigue behavior of the helical springs in compressors during start/stop testing More
Series: ASM Handbook
Volume: 11A
Publisher: ASM International
Published: 30 August 2021
DOI: 10.31399/asm.hb.v11A.a0006836
EISBN: 978-1-62708-329-4
... that are higher than expected. Note that the stresses a given spring can withstand are greatly affected by the operating environment. For example, helical springs made of 6150 steel provided failure-free service in fuel-injection pumps when the fuel oil being pumped was a normal low-sulfur grade. However, several...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.power.c0048158
EISBN: 978-1-62708-229-7
... contaminants. Contaminants Helical springs Turbines Inconel X-750 UNS N07750 Intergranular fracture Stress-corrosion cracking Springs such as that shown in Fig. 1(a) were used for tightening the interstage packing ring in a high-pressure turbine. After approximately seven years of operation...
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Published: 01 June 2019
Fig. 1 Photograph of helical compressor spring failure that occurred three active turns from the bottom. The failure origin was on the inside diameter of the spring. More
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Published: 30 August 2021
Fig. 24 Photograph of helical compressor spring failure that occurred three active turns from the bottom. The failure origin was on the inside diameter of the spring More
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0001813
EISBN: 978-1-62708-180-1
... are generally caused by operation of springs at stresses that are higher than expected. It must be kept in mind, however, that the stresses a given spring can withstand are greatly affected by the operating environment. For example, helical springs made of 6150 steel provided failure-free service in fuel...