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Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.med.c9001664
EISBN: 978-1-62708-226-6
... Abstract A compression hip screw is a device designed to hold fractures in the area of the femur in alignment and under compression. A side plate, which is an integral part of the device, is attached by screws to the femur, and it holds the compression screw in position. The device analyzed had...
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...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.modes.c0048498
EISBN: 978-1-62708-234-1
... of the compression-loading skin panel were revealed by nondestructive visual examination. A band of de-lamination between the areas of through-thickness skin fracture at the front and rear spar was revealed. A map of the local directions of crack propagation over the fracture surface was generated by the orientation...
Series: ASM Failure Analysis Case Histories
Publisher: ASM International
Published: 01 June 2019
DOI: 10.31399/asm.fach.process.c0046210
EISBN: 978-1-62708-235-8
... AFNOR 38CD4 (similar to AISI type 4140H) and was in the quenched-and-tempered condition, with a yield strength of about 760 MPa (110 ksi). It was treated to have compressive surface stresses, and the prior-austenite grain size was ASTM 8. Analysis (visual inspection, stress analyses, and macrographs...
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...
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Published: 01 June 2019
Fig. 1 Optical photograph of the fatigue region of a stainless steel compression spring that failed due to corrosion fatigue. Note beach marks on this fracture. As noted in text, beach marks are often not present in fracture surface of spring fatigue failures, which makes this case somewhat More
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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 January 2002
Fig. 15 Crack initiation on type 316LR stainless steel dynamic compression plate. (a) Anterior-posterior radiograph. The plate was used to treat the nonunion of a fracture between the fourth and seventh screws. The plate was bent intraoperatively to fit the contour of the bone. (b) Radiograph More
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Published: 01 January 2002
Fig. 49 Compression curl of bend fracture surface. (a, b) Angle views. (c) Top view showing radial marks emanating from the origin More
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Published: 01 January 2002
Fig. 59 Tension and compression side of a gray iron loaded in bending. The fracture surface is devoid of any markings to indicate the fracture origin or direction of crack propagation. However, examination of the edge of the component at the fracture surface indicates that the tension side More
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Published: 01 January 2002
Fig. 89 Crack-initiation locations in compression loading. Crack initiation may occur along the centerline and at the surface on a hoop plane. Further deformation may close the centerline crack. More
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Published: 01 June 2019
Fig. 1 Crack initiation on type 316LR stainless steel dynamic compression plate. (a) Anterior-posterior radiograph. The plate was used to treat the nonunion of a fracture between the fourth and seventh screws. The plate was bent intraoperatively to fit the contour of the bone. (b) Radiograph More
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Published: 01 June 2019
Fig. 1 Examples of failures found in stainless steel femoral compression plates More
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Published: 01 June 2019
Fig. 2 (a) Fracture surface of the femoral compression plates showing flat and slant region; (b) and (c) detail of the flat region showing fatigue striations associated with secondary cracking More
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Published: 01 June 2019
Fig. 1 A drawing showing a compression hip screw device of the type investigated here, used for fracture fixation in the vicinity of the femur. More
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Published: 01 June 2019
Fig. 2 Damage to compression casing. Back plate of disrupted impeller still in situ. More
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Published: 01 June 2019
Fig. 4 Flow stress dependence on deformation at specimen compression More
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Published: 01 June 2019
Fig. 5 Babbit microstructure after compression and forging. (a) and (b) Crack formation and failure of β and η phases (arrows) after compression for a deformation degree of 35 and 60%, respectively. (c) After forging More
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Published: 01 June 2019
Fig. 2 Case microstructure (100×) of a high-compression area of one of the two intact teeth in the spiral bevel pinion shown in Fig. 1 . Note the altered martensite in the subsurface shear plane. These “butterfly wings” extended from 0.010 to 0.035 in. below the surface. More
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Published: 01 June 2019
Fig. 4 Metallographic cross section through a fractured compression spring. Intergranular features are suggested and a plating layer is apparent on the quench crack surface. 2% Nital Etchant (Original Magnification 100 ×) More