3.6.2. Conditions tensile strength bar chord compression internal resources only other N z, corresp

Thanh called when pulling or compression chord on every cross section of the bar is only a component internal monsoon wedding axial force is N z. I see this case as bar under the effect of the force at both ends of the bar, the bar axial force has two values are equal and opposite. In fact we can see structures tensile or compression chord as:
To determine the internal forces and charting methods we use cross, cut across locations to determine the internal forces, consider the equilibrium partial liquidation, using balance equations determine axial force on the bullet should bar determine:
- Hypothesis 2: Assumptions about the class material fibers along the axial no reciprocal effects (not inserted, pressing, pushing, pushing each other), so we get σ x = σ y = 0. Conduct of materials that obey Hooke's law is proportional to stress deformation.
From assumption 2: The material monsoon wedding layer axial no reciprocal effects (not inserted, pressing, pushing, pushing each other), we get σ x = σ y = 0. Therefore, on the cross only exists only normal stress component σ z. By definition of axial force on the cross:
Longitudinal tensile or compression bar chord with relative axial deformation monsoon wedding (in the z-axis bar) is ε z. The horizontal bar (in the x, y) is also called deformation horizontal deformation. If called relative deformation monsoon wedding under the two horizontal x, y ε x, ε y, Poisson found the following relationship: monsoon wedding
Based on the predicted deformation, we have: always foretold destruction, demolition notice and destroy without notice.
Increased monsoon wedding traction from 0 until definitive form, with parts of charting laboratory equipment, we get the graph the relationship between traction and deformation P? L of sample length. It follows that the relationship between normal stress σ and ε of material deformation experiments. Graph the relationship between stress - deformation of tensile tests on specimens of plastic materials:
Similar experiments in the laboratory pull elastic monsoon wedding material, for brittle materials can not determine the rate limit, the yield that we identify only limited durability. The relationship between stress - deformation of brittle materials such as pulling charts drawing: monsoon wedding
e. Compression test specimens brittle materials similar experiment in tensile tests brittle materials, while pulling the material brittle relationship between stress monsoon wedding - deformation of brittle materials such as pulling charts drawing:
In fact fabrication, materials are often not completely homogeneous, and in the course of using the load effects may exceed the design load, the working conditions of the structure and details have not been fully considered , the assumption is not correct when calculated with the work of the structure, so the design calculations we never use dangerous stress σ 0. So for the detailed work safety in design calculations have determined a value of allowable stress for each material, denoted monsoon wedding by [σ] to calculate. Allowable stresses shall be less dangerous than stress and maximum stress generated in the details do not exceed allowable monsoon wedding stress. Allowable stresses are determined by the formula:
3.6.2. Conditions tensile strength bar chord compression internal resources only other N z, corresponding to the stress on the cross only normal stress σ z. Therefore, want to ensure the safe working of the bar tensile strength (compression) chord, the stress in the bar to the terms and conditions:
Step 1: Write the equation for deformation, determine the associated jet. Determine Jet link redundancy. Step 2: Perform as a static problem with the external forces monsoon wedding acting on the system including external and jet
2014 (8) October (1) September (4) Chapter monsoon wedding 3: PULL (COMPRESSED) RIGHT MIND Exercise monsoon wedding theoretical mechanics: Part 1: Statics Engineering Drawing monsoon wedding Exercise Exercise Strength of Materials Chapter 2 August (3)