scholarly journals Extension fracture formation in mechanical layers :

2017 ◽  
Vol 82 (1) ◽  
pp. 54-62
Author(s):  
Tetsuzo Fukunari
Keyword(s):  
Fracture Formation ◽  
Extension Fracture

Study on Micro-Fracture Chaotic Evolution under External Loading Rock

2013 ◽  
Vol 813 ◽  
pp. 355-358 ◽  
Author(s):  
Ting Ting Wang ◽  
Wan Chun Zhao ◽  
Yuan Hong Liu ◽  
Li Yang ◽  
Hong Yu Gao
Keyword(s):  
Finite Element ◽  
Chaos Theory ◽  
Formation Process ◽  
Theoretical Calculations ◽  
Growth Behavior ◽  
External Loading ◽  
Software Simulation ◽  
Finite Element Software ◽  
Fracture Formation ◽  
Simulation Results

In order to accurately describe the growth behavior of the micro-fracture under the action of the rock external load, this paper proposes the use of chaos theory to describe the fracture formation process, explains the chaotic characteristics of the fracture from the perspective of the growth of micro-fracture, the number of growth and fracture formation morphology, respectively. Selecting the practical block of an oilfield, the theoretical calculation and finite element software simulation results show that, theoretical calculations are accurate and reliable.

Application of Indentation Method for Quality Control of Processing of Ceramic Details

2016 ◽  
Vol 827 ◽  
pp. 7-10 ◽  
Author(s):  
Valery V. Kuzin ◽  
Sergey N. Grigoriev ◽  
Sergey Fedorov
Keyword(s):  
Quality Control ◽  
Pulse Laser ◽  
Experimental Studies ◽  
Laser Machining ◽  
Ceramic Surface ◽  
Local Fracture ◽  
Indentation Method ◽  
Fracture Formation ◽  
Fracture Area ◽  
Parts Manufacturing

This paper describes approaches developed for the using of indentation method for evaluating the effectiveness of traditional and innovative kinds of ceramic parts manufacturing. Experimental studies revealed relationship between conditions of the grinding and pulse laser machining with the number and length of cracks, as well as local fracture area during indentation. Essential impact of regimes of these technological processes on the nature of cracks and local fracture formation during indentation of oxide-carbide ceramic surface was disclosed. The analysis of effectiveness of different methods of forming the surface of ceramic parts using the revealed effects was done.

Success ful Kyphoplasty in the Presence of Severe Retropulsion of Lumbar Spine without Neurological Deficits

2020 ◽  
pp. 127-130
Author(s):  
Ruben H. Schwartz
Keyword(s):  
Lumbar Spine ◽  
Compression Fracture ◽  
Disease Process ◽  
The Elderly ◽  
Fracture Pattern ◽  
Neurological Deficits ◽  
Vertebral Compression Fractures ◽  
Common Disease ◽  
Fracture Formation ◽  
Increased Risk

Background: Vertebral compression fractures are common causes of back pain in the aging patient population. Osteoporosis is an extremely common disease process within the elderly population, especially females, placing these patients at an increased risk of compression fracture formation. Besides pain, the fracture pattern can increase the risk of neurological compromise as well. Retropulsed fragments of the vertebral body cause impingement on the spinal canal and can be catastrophic. Case Report: We present the case of a 72-year-old man with 5 mm retropulsion of the lumbar spine at the L1 level without signs of neurological compromise. This extensive amount of retropulsion causing no signs of weakness is rare. He was subsequently successfully treated with kyphoplasty after failed conservative therapies. Conclusions: A case by case basis must be utilized when considering kyphoplasty for patients with retropulsion of the spine. If a patient’s pain persists after conservative therapy, then kyphoplasty can be utilized with full knowledge of the risks involved. Key words: Retropulsion, kyphoplasty, lumbago, spinal stenosis

Przegląd wybranych atraumatycznych metod ekstrakcji

2019 ◽  
Vol 24 (3) ◽  
Author(s):  
Piotr Grad ◽  
Aleksandra Paruzel-Pliskowska ◽  
Andrzej Żegleń ◽  
Jolanta Pytko-Polończyk
Keyword(s):  
Tooth Extraction ◽  
Alveolar Bone ◽  
Optimal Conditions ◽  
Excessive Force ◽  
Prosthetic Rehabilitation ◽  
Prosthetic Reconstruction ◽  
Surgical Tools ◽  
Periodontal Tissues ◽  
Fracture Formation ◽  
Mucoperiosteal Flap

Tooth extraction is one of the most common dental surgical procedures. Its success depends on the operator’s knowledge, skills and experience. Proper choice of tools is also important. Incorrect tooth extraction using excessive force may cause local complications, such as damage to the soft tissue or to the extracted or neighbouring tooth with potential translocation, bone fracture, formation of an oral sinus communication or even mandibular dislocation. Currently, efforts are being made to develop methods that will allow for the preservation of intact surrounding periodontal tissues to facilitate subsequent prosthetic rehabilitation. Surgical tools used in atraumatic tooth extraction include, among other things, Physics Forceps, periotomes, luxators, and the Benex extractor system. These tools reduce the risk of damage to the vestibular lamina of the alveolar bone, allow for avoiding the need for a mucoperiosteal flap and reduce the incidence of postoperative pain. This helps create optimal conditions for subsequent implant prosthetic reconstruction. The paper presents the characteristics and application of selected tools used in atraumatic tooth extraction.

PARAMETERIZATION OF REAXFF POTENTIAL OF MG/AL/SI/O INTERACTION AND INVESTIGATION OF MECHANICAL PROPERTIES FOR S-GLASS

2021 ◽  
Author(s):  
JEJOON YEON ◽  
SANJIB C. CHOWDHURY ◽  
CHAITANYA M. DAKSHA ◽  
DONATO BELMONTE ◽  
ADRI VAN DUIN ◽  
...  
Keyword(s):  
Progressive Failure ◽  
Valence Angle ◽  
Glass Structure ◽  
Bond Distance ◽  
Heat Of Formation ◽  
Value Analysis ◽  
Structure And Property ◽  
Static Modulus ◽  
Fracture Formation ◽  
Bridge Oxygen

New ReaxFF parameters are developed for the description of Mg/Al/Si/O interaction for the Magnesium Aluminosilicate (MAS) glass structure. The training set contains energy curves from equation of state for various Mg/Al/Si/O crystals, valence angle and bond distance scan, and heat of formation for the Mg/Al/Si/O interactions. A semi-automated Genetic Algorithm assisted by Artificial Neural Network is applied for this parametrization. Validation efforts showed the current ReaxFF parameter set can describe the atomistic structure and property of tectosilicate MAS glass including S-glass. Estimated quasi-static modulus of S-glass structure matches well with experimental value. Analysis shows the key of high modulus of S-glass is numerous Mg-BO (Bridge Oxygen) interactions across the Mg-O-AlSi structure. In addition, atomistic origin of high ductility and progressive failure of S-glass is derived from the reconstruction of the atomic structure, forming Mg-BO-Si interactions that delays fracture formation.

Numerical Simulation on Fracture Formation on Surfaces of Bi-Layered Columnar Materials

2012 ◽  
Vol 446-449 ◽  
pp. 2929-2933
Author(s):  
Tian Hui Ma ◽  
Chun An Tang ◽  
Lian Chong Li ◽  
Zheng Zhao Liang ◽  
Yong Bin Zhang
Keyword(s):  
Numerical Simulation ◽  
Fracture Formation
Sign in / Sign up

Export Citation Format

Share Document