Fatigue-life of two manual wheelchair cross-brace designs

被引:6
作者
Cooper, RA
DiGiovine, CP
Rentschler, A
Lawrence, BM
Boninger, ML
机构
[1] VA Pittsburgh Hlth Care Syst, Human Engn Res Labs 151R1, Pittsburgh, PA 15206 USA
[2] Univ Pittsburgh, Dept Rehabil Sci & Technol, Pittsburgh, PA 15260 USA
[3] Univ Pittsburgh, Dept Bioengn, Pittsburgh, PA 15260 USA
[4] Univ Pittsburgh, Med Ctr Hlth Syst, Div Phys Med & Rehabil, Pittsburgh, PA 15260 USA
来源
ARCHIVES OF PHYSICAL MEDICINE AND REHABILITATION | 1999年 / 80卷 / 09期
关键词
D O I
10.1016/S0003-9993(99)90064-3
中图分类号
R49 [康复医学];
学科分类号
100215 ;
摘要
Objective: To compare the durability of two designs of cross-braces for folding manual wheelchairs and to determine the nature of wheelchair cross-brace failures. Design: Fatigue testing of two folding wheelchair cross-brace designs (one with a rectangular cross-section and the other with a circular cross-section). A total of 20 cross-brace pairs were tested, Results: The cross-braces with a circular cross-section endured a mean +/- SD of 100,159 +/- 45,814 cycles before experiencing a fatigue failure, whereas the cross-braces with a rectangular cross-section endured an average of 261,254 +/- 160,741 cycles. A t test showed significant differences (p = .01) in fatigue-life between cross-braces with a circular cross-section versus cross-braces with a rectangular cross-section. All 20 cross-braces experienced similar fatigue failures that would develop at the bolt hole where the two cross-braces connect to form a hinge. Conclusion: The results suggest that the rectangular cross-brace design has a longer fatigue-life than the circular cross-brace design. People should regularly inspect the cross-brace for cracks. The area around the bolt forming the hinge should be inspected carefully. If a crack is observed, the cross-brace should be replaced immediately. (C) 1999 by the American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation.
引用
收藏
页码:1078 / 1081
页数:4
相关论文
共 15 条
[1]  
Ashby M. F., 2016, Materials Selection in Mechanical Design
[2]  
BALDWIN JD, 1993, J REHABIL RES DEV, V30, P224
[3]  
BALDWIN JD, 1995, J REHABIL RES DEV, V32, P245
[4]  
BRATTGARD SO, 1984, SCAND J REHABIL MED, V9, P15
[5]   FATAL WHEELCHAIR-RELATED ACCIDENTS IN THE UNITED-STATES [J].
CALDER, CJ ;
KIRBY, RL .
AMERICAN JOURNAL OF PHYSICAL MEDICINE & REHABILITATION, 1990, 69 (04) :184-190
[6]   Performance of selected lightweight wheelchairs on ANSI/RESNA tests [J].
Cooper, RA ;
Gonzalez, J ;
Lawrence, B ;
Renschler, A ;
Boninger, ML ;
VanSickle, DP .
ARCHIVES OF PHYSICAL MEDICINE AND REHABILITATION, 1997, 78 (10) :1138-1144
[7]  
Cooper RA, 1996, J REHABIL RES DEV, V33, P45
[8]  
Cooper RA, 1998, WHEELCHAIR SELECTION
[9]   WHEELCHAIR SAFETY - ADVERSE REPORTS TO THE UNITED-STATES FOOD-AND-DRUG-ADMINISTRATION [J].
KIRBY, RL ;
ACKROYDSTOLARZ, SA .
AMERICAN JOURNAL OF PHYSICAL MEDICINE & REHABILITATION, 1995, 74 (04) :308-312
[10]  
Lipskin R, 1970, Bull Prosthet Res, V10, P121