scholarly journals Strain energy density distribution of vertebral body of two motion segment model under combined compression and sagittal bending moment – an in vitro porcine spine biomechanical study

2004 ◽  
Vol 27 (6) ◽  
pp. 929-936
Author(s):  
Jaw‐Lin Wang ◽  
Yuan‐Chuan Tsai ◽  
Been‐Der Yang
Keyword(s):  
Energy Density ◽  
Density Distribution ◽  
Vertebral Body ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Bending Moment ◽  
Biomechanical Study ◽  
Energy Density Distribution ◽  
Segment Model

The effect of cement mantle thickness on strain energy density distribution and prediction of bone density changes around cemented acetabular component

2018 ◽  
Vol 232 (9) ◽  
pp. 912-921 ◽  
Author(s):  
Devismita Sanjay ◽  
Subrata Mondal ◽  
Richa Bhutani ◽  
Rajesh Ghosh
Keyword(s):  
Energy Density ◽  
Density Distribution ◽  
Acetabular Component ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Cement Mantle ◽  
Thickness Variation ◽  
Acetabular Cup ◽  
Energy Density Distribution ◽  
Mantle Thickness

Cement mantle thickness is known to be one of the important parameters to reduce the failure of the cemented acetabular component. The thickness of the cement mantle is also often influenced by the positioning of the acetabular cup. The aim of this study is to determine the effect of uniform and non-uniform cement mantle thickness on strain energy density distribution and prediction of the possibility of bone remodelling around the acetabular region. Furthermore, tensile stress distribution in the cement mantle due to non-uniform cement mantle thickness was also investigated. Three-dimensional finite element models of intact and 17 implanted pelvic bone were developed based on computed tomography data sets. Results indicate that implantation with non-uniform cement thickness variation in the anterior–posterior direction has a significant influence on strain energy density distribution around the acetabulum as compared to thickness variation in the superior–inferior direction. Increase in density is predicted at the anterior part of the acetabulum, whereas density decrease is predicted at the posterior, inferior and superior part of the acetabulum. The non-uniform cement mantle thickness affected the tensile stress distribution in the cement mantle, in particularly superiorly placed acetabular cup. This study concludes that uniform cement thickness is desired for the longer success of the cemented acetabular component.

scholarly journals Mechanism by Which Backfill Body Reduces Amount of Energy Released in Deep Coal Mining

2019 ◽  
Vol 2019 ◽  
pp. 1-14
Author(s):  
Wenyue Qi ◽  
Jixiong Zhang ◽  
Nan Zhou ◽  
Zhongya Wu ◽  
Jun Zhang
Keyword(s):  
Energy Density ◽  
Coal Mining ◽  
Coal Mine ◽  
Strain Energy Density ◽  
Strain Energy ◽  
Mining Area ◽  
Filling Material ◽  
Ultrahigh Energy ◽  
Energy Density Distribution ◽  
Working Face

Deep coal mining is unavoidable, and the complex mining environments and the increasing dangers associated with ultrahigh energy accumulation and release from mining disturbances renders it extremely difficult to maintain a safe and stable stope. Solid backfilling technology directly uses coal gangue and other solid wastes in the mining area to fill the gob after mining. Support from the backfill body can inhibit the movement of overlying rock strata and significantly alleviate the influence of mining. In this study, the correlations between the deformation of gangue filling material and the characteristics of energy dissipation were examined under lateral uniaxial compression. The strain energy density distributions of backfilling and caving mining methods were simulated using numerical modeling. The results showed that the strain energy density distribution of backfilling mining was less concentrated, and its peak value was lower than that of caving mining by 51.0%, indicating that backfilling could effectively reduce the amount of energy released from mining rocks. The dense backfill mining area of the No. 9301 face in Tangkou Coal Mine was used as a case study. Measures for controlling the backfill body compaction for reducing the amount of energy released from mining rocks were proposed. These measures include optimizing the support structure and filling material formula, controlling the preroof subsidence, and ensuring an appropriate number of tamping strokes. The monitoring results of the backfilling quality, surface subsidence, and microseismic energy of No. 9301 working face in Tangkou Coal Mine showed that when the backfill body filling ratio control value was 82.28%, the total number of microseisms and the amount of energy released from the mining working face were significantly lower compared to those of the caving method. This study demonstrated that the backfill body could effectively reduce the amount of energy released from mining rocks, thereby realizing management of mine earthquake and sustainable deep coal mining.

Sign in / Sign up

Export Citation Format

Share Document