Estimating lumber properties with acoustic-based technologies—Part 2: Ultimate tension stress estimation from time- and frequency-domain parameters

2020 ◽  
Vol 52 (4) ◽  
pp. 390-399
Author(s):  
Christopher Adam Senalik ◽  
F. J. N. França ◽  
R. D. Seale ◽  
Robert J. Ross ◽  
R. Shmulsky
Keyword(s):  
Frequency Domain ◽  
Tension Stress ◽  
Stress Estimation

The Turkish Adaptation of the Triangular Relationship Inventory: The Validity and Reliability Study

2021 ◽  
pp. 106648072110230
Author(s):  
Çiğdem Yavuz Güler
Keyword(s):  
Psychometric Properties ◽  
Convergent Validity ◽  
Goodness Of Fit ◽  
Satisfaction With Life ◽  
Family System ◽  
Measurement Tool ◽  
Tension Stress ◽  
Validity And Reliability ◽  
The Family ◽  
Triangular Relationship

Objective: According to the family systems theory, triangulation is defined as reflecting and conveying the tension between two individuals to a third individual to reduce the existing tension, stress, and anxiety. This study was conducted to adapt the “Triangular Relationship Inventory” to Turkish and to assess psychometric properties. Method: The sample of the study included 337 individuals (234 women and 103 men) aged between 18 and 25 years. The structure validity of the inventory was evaluated with the confirmatory factor analysis and reliability was evaluated with Chronbach's alpha internal consistency coefficient, test–retest method, and item analyses. Results: The result showed that the Turkish form of the Triangular Relationship Inventory showed similar psychometric properties to the original inventory. The structure which consists of the balanced, mediator, cross-generational coalition, and scapegoat subdimensions of 24 items displayed acceptable goodness-of-fit values in the Turkish sample with the 0.91 Cronbach's alpha coefficient while the reliability values of the subdimensions changed between 0.86 and 0.91. Considering the convergent validity of the inventory, there was a negative correlation between the triangular relationship and satisfaction with life and the differentiation of self, and a significant positive correlation with depression, anxiety, and stress. Conclusion: The psychometric properties revealed in this study show that the Turkish form of the Triangular Relationship Inventory is a valid and reliable measurement tool that can be used to measure the triangulation levels and roles of the individuals, who are in the Turkish sample and between the ages of 18 and 25 years, within the family system.

Low-Cycle Fatigue Behaviour of Gas Turbine Alloys

1974 ◽  
Vol 188 (1) ◽  
pp. 321-328 ◽  
Author(s):  
W. J. Evans ◽  
G. P. Tilly
Keyword(s):  
Low Cycle Fatigue ◽  
Fatigue Cracks ◽  
High Stress ◽  
Cyclic Creep ◽  
Fatigue Curve ◽  
Fatigue Behaviour ◽  
Material Surface ◽  
Tension Stress ◽  
Cycle Fatigue ◽  
Stress Tests

The low-cycle fatigue characteristics of an 11 per cent chromium steel, two nickel alloys and two titanium alloys have been studied in the range 20° to 500°C. For repeated-tension stress tests on all the materials, there was a sharp break in the stress-endurance curve between 103 and 104 cycles. The high stress failures were attributed to cyclic creep contributing to the development of internal cavities. At lower stresses, failures occurred through the growth of fatigue cracks initiated at the material surface. The whole fatigue curve could be represented by an expression developed from linear damage assumptions. Data for different temperatures and types of stress concentration were correlated by expressing stress as a fraction of the static strength. Repeated-tensile strain cycling data were represented on a stress-endurance diagram and it was shown that they correlated with push-pull stress cycles at high stresses and repeated-tension at low stresses. In general, the compressive phase tended to accentuate cyclic creep so that ductile failures occurred at proportionally lower stresses. Changes in frequency from 1 to 100 cycle/min were shown to have no significant effect on low-cycle fatigue behaviour.

Meshing Stiffness and Tooth Root Stress for Internal Cylindrical Gears With Thin Rim

2003 ◽  
Author(s):  
Jean-Pierre de Vaujany ◽  
Miche`le Guingand ◽  
Didier Remond
Keyword(s):  
3D Model ◽  
Statistical Design ◽  
Tension Stress ◽  
Tooth Root ◽  
Meshing Stiffness ◽  
Cylindrical Gears ◽  
Maximal Tension ◽  
Experiment Method ◽  
Internal Gear ◽  
Root Stress

The main objective of this study is to quantify the influence of the deformation of the rim of an internal gear on the meshing stiffness and the stress distribution in tooth fillets. The 3D model used is based on a method derived from the Finite Prism Method. Tooth bending effects and contact deformations are processed simultaneously. Scientific use of the software has resulted in formulating an equation to calculate the maximal tension stress in the tooth root. This formula has been obtained by using the statistical design of experiment method.

Stress Analysis of Cement Concrete Pavement under Overweight Loads

2012 ◽  
Vol 446-449 ◽  
pp. 949-953
Author(s):  
Ya Ni Lu ◽  
Tao Li Xiao
Keyword(s):  
Finite Element ◽  
Regression Analysis ◽  
Finite Element Model ◽  
Element Model ◽  
Concrete Pavement ◽  
The Other ◽  
Tension Stress ◽  
Statistical Regression ◽  
Cement Concrete ◽  
Cement Concrete Pavement

Special load has produced serious damage to the concrete pavement because of the great gross weight and heavy axle load, but the present specification has not mentioned this kind of load. On this occasion, Several conditions of critical load are identified through ANSYS finite element model analysis and the formula through statistical regression analysis to the bottom maximum tension stress is drawn up. Which can not only guide the concrete pavement design under the special load but also the result may be referred by the other kinds of engineering.

scholarly journals The Synergistic Effect of Temperature and Loading Rate on Deformation for Thermoplastic Fiber Metal Laminates

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4210
Author(s):  
Kai Jin ◽  
Shanyong Xuan ◽  
Jie Tao ◽  
Yujie Chen
Keyword(s):  
Melting Point ◽  
Softening Point ◽  
Bending Strength ◽  
Loading Rate ◽  
Synergistic Effects ◽  
Effect Of Temperature ◽  
Resin Matrix ◽  
Tension Stress ◽  
Fiber Metal Laminates ◽  
Fiber Metal

The glass fiber reinforced polypropylene/AA2024 hybrid laminates (short for Al/Gf/PP laminates) as structural materials were prepared and formed by hot pressing. The synergistic effects of temperature and loading speed on the laminate deformation under tensile and bending conditions were investigated and analyzed in this study. In tension, stress–strain curves presented bimodal types effected by tensile rates and temperatures. The state of PP resin determines the mechanical behavior of the FMLs. The tensile rate has no effect on FML deformation without heating or over the melting point of PP resin (about 170 °C). The softening point of PP resin (about 100 °C) is characteristic temperature. When the temperature exceeds the softening point but does not reach the melting point, the tensile strength and elongation will demonstrate coordinated growth at a relatively high tensile speed. The efficiency of fiber bridging is affected significantly since the resin is the medium that transfers load from the metal to the fiber. Under bending, the curves presented a waterfall decrement with temperature increment. The softening point of resin matrix is the key in a bending process. When the temperature is near the softening point, deformation is sensitive to both the temperature and the loading speed to a certain extent. If temperature is lower than softening point, deformation is mainly guided by temperature. If the temperature is beyond the softening point, loading speed is in a leading position of deformation. The bending strength gradually increases with loading rate. By using these deformation characteristics, the deformation of the thermoplastic laminates can be controlled in stamping or other plastic forming processes for thermoplastic fiber metal laminates.

scholarly journals Analysis of static structural of ocean FARMITS offshore cage due to environmental load

2018 ◽  
Vol 177 ◽  
pp. 01023
Author(s):  
Yani Purnawanti ◽  
Nur Syahroni ◽  
Yeyes Mulyadi
Keyword(s):  
Maximum Yield ◽  
Structural Response ◽  
Fish Farming ◽  
Frame Structure ◽  
Mooring Line ◽  
Strength Analysis ◽  
Tension Stress ◽  
Random Waves ◽  
Cage Structure ◽  
Static Structure

Consumption of fish in Indonesia continuously increase from 2000 to 2014. Particularly fish farming in Java from 2006-2014 is quite high, so there need to be adequate facilities for fish farming. Responding to these challenges, we developed Offshore Cage Ocean FARMITS technology specifically designed For the southern waters of Java Island. This paper discusses the static structure strength analysis of deformation and maximum yield strength that occurs on the offshore cage structure of Ocean FARMITS. The frame structure made of hollow pipe made from HDPE will be placed at 4,41m Wave Height, with a period of 19s. Numerical simulations are performed to obtain a motion response RAO and structural response due to random waves. This Structure is then analyzed under mooring conditions with the Catenary Mooring configuration. Rope stress that occur due to environmental loads will give tension stress to the structure, resulting in the offshore cage structure to occur maximum stress and deformation. The result of this research is to prove that the structure that is made by HDPE able to restrain the tension force of mooring line stress. This has been validated by the standard of Practical Aspects of Offshore Aquaculture System Design from Aquaculture America, so this structure can be said to be operating safely under Indonesian Irregular Wave.

scholarly journals Influence of Bitumen Type and Asphalt Mixture Composition on Low-Temperature Strength Properties According to Various Test Methods

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2118 ◽  
Author(s):  
Marek Pszczola ◽  
Cezary Szydlowski
Keyword(s):  
Tensile Strength ◽  
Low Temperature ◽  
Cooling Rate ◽  
Strength Properties ◽  
Test Methods ◽  
Asphalt Mixtures ◽  
Bending Test ◽  
Mixture Composition ◽  
Tension Stress ◽  
Strength Reserve

In regions with low-temperatures, action transverse cracks can appear in asphalt pavements as a result of thermal stresses that exceed the fracture strength of materials used in asphalt layers. To better understand thermal cracking phenomenon, strength properties of different asphalt mixtures were investigated. Four test methods were used to assess the influence of bitumen type and mixture composition on tensile strength properties of asphalt mixtures: tensile strength was measured using the thermal stress restrained specimen test (TSRST) and the uniaxial tension stress test (UTST), flexural strength was measured using the bending beam test (BBT), and fracture toughness was measured using the semi-circular bending test (SCB). The strength reserve behavior of tested asphalt mixtures was assessed as well. The influence of cooling rate on the strength reserve was investigated and correlations between results from different test methods were also analyzed and discussed. It was observed that the type of bitumen was a factor of crucial importance to low-temperature properties of the tested asphalt concretes. This conclusion was valid for all test methods that were used. It was also observed that the level of cooling rate influenced the strength reserve and, in consequence, resistance to low-temperature cracking. It was concluded that reasonably good correlations were observed between strength results for the UTST, BBT, and SCB test methods.

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