| JaLCDOI | 10.18926/AMO/53523 |
|---|---|
| フルテキストURL | 69_3_165.pdf |
| 著者 | Sarai, Takaaki| Tokumoto, Akihiro| |
| 抄録 | Fall accidents are a common cause of femoral fracture in the elderly. The greater trochanter of the femur is often subjected to impact loading by a sideways fall, and thus it is worth studying the impulsive stress waves propagating in the femur. In this study, the impulsive stress was analyzed by the dynamic finite element method using a 3-dimensional model of the femur, and the influence of the fall configuration on the stress was discussed. The stress was concentrated around the femoral neck during the propagation of the stress wave, and the tensile maximum principal stress changed into compressive minimum principle stress on the anterior and medial sides of the neck. On the other hand, the compressive minimum principal stress changed into tensile maximum principle stress on the lateral side of the neck. The largest maximum principal stress during the impact loading was always larger in the neck than in the impact region. The largest absolute value of the minimum principal stress was found in the neck or the impact region depending on the fall configuration. The largest absolute values of the maximum and minimum principal stress were nearly equal, indicating that the bone fracture due to the tensile stress may occur around the femoral neck. |
| キーワード | biomechanics sideways fall femoral neck greater trochanter impulsive stress wave |
| Amo Type | Original Article |
| 出版物タイトル | Acta Medica Okayama |
| 発行日 | 2015-06 |
| 巻 | 69巻 |
| 号 | 3号 |
| 出版者 | Okayama University Medical School |
| 開始ページ | 165 |
| 終了ページ | 171 |
| ISSN | 0386-300X |
| NCID | AA00508441 |
| 資料タイプ | 学術雑誌論文 |
| 言語 | 英語 |
| 著作権者 | CopyrightⒸ 2015 by Okayama University Medical School |
| 論文のバージョン | publisher |
| 査読 | 有り |
| PubMed ID | 26101192 |
| Web of Science KeyUT | 000356903000005 |
| 著者 | Tanaka, Yutaka| Tsukaoka, Hideki| Takeda, Hidetoshi| Honda, Kazuo| Sarai, Takaaki| |
|---|---|
| 発行日 | 1991-11 |
| 出版物タイトル | Intelligent Robots and Systems '91. 'Intelligence for Mechanical Systems |
| 巻 | 1巻 |
| 資料タイプ | 学術雑誌論文 |
| JaLCDOI | 10.18926/15681 |
|---|---|
| フルテキストURL | Mem_Sch_Eng_OU_10_2_1.pdf |
| 著者 | Honda Kazuo| Hosokawa Norio| Sarai Takaaki| |
| 抄録 | The diffracted intensity of X-ray depends upon several physical and geometrical factors such as structure, multiplicity, absorption and Lorentzpolarization and measuring conditions such as time constant and scanning speed of detector on counter method[l]. For analyzing on the X-ray stress measurement, especially, profile shape of X-ray diffraction which is affected by geometrical factors such as absorption and Lorentz-polarization is very important. In order to eliminate these factors affecting the stress measured by using X-ray, the correcting factors were introduced and those theoretical values were calculated. After this theoretical calculation, it is found that as the half value breadth increases the difference between the stress measured by using X-ray and the corrected one becomes larger and larger under same measuring condition. When the ideal diffracted intensity of X-ray is assumed Cauchy distribution the measured stress depends upon measuring condition for same specimen, but it is independent of measuring condition in Gauss, distribution. Consequently, it is found that the stress measured by using X-ray must be corrected under each measuring condition and the method of correction is made clear and proved experimentally in this paper. |
| 出版物タイトル | Memoirs of the School of Engineering, Okayama University |
| 発行日 | 1976-01-27 |
| 巻 | 10巻 |
| 号 | 2号 |
| 開始ページ | 1 |
| 終了ページ | 13 |
| ISSN | 0475-0071 |
| 言語 | 英語 |
| 論文のバージョン | publisher |
| NAID | 120002307339 |