Investigation of Forces and Stresses Acting on a Shoulder-Hand System Considering Strains in Muscles

Ziya ABDULALIYEV; Özgür ÇELİK; Gültekin GÖLLER; E. Sabri KAYALI

Makale detayları

Investigation of Forces and Stresses Acting on a Shoulder-Hand System Considering Strains in Muscles

Yazarlar:

Ziya ABDULALIYEV | Özgür ÇELİK | Gültekin GÖLLER | E. Sabri KAYALI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Engineering and Environmental Sciences 2007 Vol.31 Issue 1, pp.1-8

Belge Tipi:

Makale

Yayın Tarihi:

12/2006

Belge Dili:

Türkçe

Document ID (Org No.):

2000744950

Sıklık:

Üç Yıllık

eISSN:

1303-6157

pISSN:

1300-0160

Özet:

 

A model is proposed to investigate the forces and stresses  acting on bones in a shoulder-hand system due to straining of muscles  during daily physical activities.  This model is proposed as a truss  system consisting of beams, or rods, corresponding to the considered  bones and muscles, connected by frictionless joints.  One of the hard  loading positions, which occurs when one does pull-ups while holding  onto a bar (a common fitness activity), is considered in the proposed  model as an example.  The stress is found to increase from the elbow  end of the humerus bone toward the shoulder end.  The stress in the  example study reached a maximum value of approximately 8000 N/cm2  near the shoulder end during the pull-up motion, which is about 20%  less than the maximum stress calculated when the straining of muscles  was neglected.  The difference between these 2 maximum values of  stress indicates the effect of strained muscles, which was first taken  into consideration in this study.  This stress value is considerably  high when the strength of bones is taken into account.  It is also  necessary to take into account the stress fluctuations in the human  body during various daily activities; fluctuating stresses acting on  an implant may create fatigue cracks at the shoulder end of the  humerus in addition to a high stress concentration factor due to shape  and size changes in the humerus bone.

 

A model is proposed to investigate the forces and stresses  acting on bones in a shoulder-hand system due to straining of muscles  during daily physical activities.  This model is proposed as a truss  system consisting of beams, or rods, corresponding to the considered  bones and muscles, connected by frictionless joints.  One of the hard  loading positions, which occurs when one does pull-ups while holding  onto a bar (a common fitness activity), is considered in the proposed  model as an example.  The stress is found to increase from the elbow  end of the humerus bone toward the shoulder end.  The stress in the  example study reached a maximum value of approximately 8000 N/cm2  near the shoulder end during the pull-up motion, which is about 20%  less than the maximum stress calculated when the straining of muscles  was neglected.  The difference between these 2 maximum values of  stress indicates the effect of strained muscles, which was first taken  into consideration in this study.  This stress value is considerably  high when the strength of bones is taken into account.  It is also  necessary to take into account the stress fluctuations in the human  body during various daily activities; fluctuating stresses acting on  an implant may create fatigue cracks at the shoulder end of the  humerus in addition to a high stress concentration factor due to shape  and size changes in the humerus bone.

Makale detayları

Investigation of Forces and Stresses Acting on a Shoulder-Hand System Considering Strains in Muscles

Yazarlar: Ziya ABDULALIYEV | Özgür ÇELİK | Gültekin GÖLLER | E. Sabri KAYALI

Yayıncı: TUBITAK

Dergi: Turkish Journal of Engineering and Environmental Sciences 2007 Vol.31 Issue 1, pp.1-8

Belge Tipi: Makale

Yayın Tarihi: 12/2006

Belge Dili: Türkçe

Document ID (Org No.): 2000744950

Sıklık: Üç Yıllık

eISSN: 1303-6157

pISSN: 1300-0160

Sayı

Yazarlar:

Ziya ABDULALIYEV | Özgür ÇELİK | Gültekin GÖLLER | E. Sabri KAYALI

Yayıncı:

TUBITAK

Dergi:

Turkish Journal of Engineering and Environmental Sciences 2007 Vol.31 Issue 1, pp.1-8

Belge Tipi:

Makale

Yayın Tarihi:

12/2006

Belge Dili:

Türkçe

Document ID (Org No.):

2000744950

Sıklık:

Üç Yıllık

eISSN:

1303-6157

pISSN:

1300-0160