Chapter 842

When it is small to a certain extent, this place will turn around. I heard that this is a typical feature of plastic material failure. One value is inside, but a cross-section shrinks and shrinks. To a certain extent, the pull up we have just now is a typical elasticity, so there is another concept of strengthening, the one that can only bear the most, this is what we call Camacho. It was the biggest one when I pulled it off. Yield strength and tensile strength are very good in this picture. that! Then we are talking about a concept called generals. It must be the actual measured value of Kara strength. The actual measurement of the above yield strength. That is, when using CMD, compared with cf. This time we call it strong, because we think the endurance limit just now, but there is still a lot of room for him to exercise. The larger the space, the better the steel safety reserve. We require that we must standardize it. Approximately equal to. 1.25 This is the concept of difference, and this is the meaning of our article. This is the ratio of the measured tensile strength to the yield strength just now. What do you mean? Is the actual value of the yield strength? Compared to the yield strength standard. It’s like the difference between actual and theoretical is too big. The two of them are as close as possible so that the closer the better, this is what our regulations stipulate to do with these two words, less than or equal to. Must be qualified. The ratio of all characteristic values ​​stipulated in Article 2 cannot exceed one point. After pulling it just now, it is impossible to return to its original state. Use your sample length after production, and multiply it by 100%. The greater the elongation, the harder the extensibility, the better, and it is different. This is the maximum we stipulated. What index is the steel described? Plasticity index. The bigger the word, the better. Three resistance to tensile impact fatigue, tensile performance, what index is used to evaluate the reliability of steel? What is the expression of the plasticity of steel? The elongation is used to express the number, and the larger the better, how to calculate it? What are the eligibility criteria? Critical temperature? At that time, we had to consider what is shocking, what is fatigue, repeatedly. Just in underfoot, the understanding of this graph and the three cases can be judged cases. Even if it is strong, it will count. hrb4 version. So let us talk about the strength of steel again, which means shrb335, hrb. hrbhHPb is hotter. Hot-rolled round steel bars. HP 300. standard value. Greater than the criterion of =300=328=300. This first-class steel is made of steel and concrete because it is smooth. I used to attack. Strong enough. There are also wall panels. Or let me count these kinds. hrb335HRb4HR hot rolled. Back rib reinforcement. This is what we commonly call this, that is, our secondary steel symbol is this. It is the grade three steel in our current market, two slashes. It’s not good like this. Class 1 Class 2 Class 3 Class 4, we are mainly using Class 2 and Class 3 steel, the direction of the beams and columns. The book this man is looking for is also on. The strength of steel must be deteriorated by some high-speed performance, which is mainly used. This question should be chosen. 550, the total elongation of the maximum force is 10%. Which of the following statements is correct, right? If you want to compare you to someone, you must use 550 or more than 420, which equals 1.305. If you are qualified or unqualified, you are also qualified. The actual measurement of the yield strength is sufficient to tame the strength standard 1.0. It is enough if the percentage is greater than 9%. The lower the temperature value of the three-grade steel mainly used for steel, the lower the temperature value of the stressed steel bars acting on the components, which means that the style of this sentence has just been said. What I can’t see in many test sites is my own. Well, let’s take a look at the second content below. Cement was also an exam question at that time. Everyone knows the name of the six major cements, Portland cement. Volcanic ash. There were also officials in 18 years, no longer than 6.5 other cements. Then he still has to be unqualified here. If something fails. What is the level of this cement nail? The better the uniformity of the volume change of cement during the setting and hardening process, the higher it will be, which must cause the expansion series. Do you want to open some cement nails with unqualified stability? Unqualified stability must be right. What is the original cause? There is too much calcium oxide and magnesium oxide in the clinker of cement, and what is called alkaline oxide, calcium oxide, after encountering water, he will have a chemical reaction in the corner of his wall. More important is physical strength. There must be a strategy back then. It is mainly for everyone to grasp the strength of cement. The strength of cement is generally measured by his method for three-day and 28-day compression and resistance of 32.5, 42.5, 52.5, 62.5, usually more than 4000 yuan. 32.5-42.552.56. Therefore, the most important thing for everyone at the time was the same called high hot water. You see, the height is fast, the early period has high strength, good frost resistance, and the characteristic is relatively strong corrosion resistance. Brother-in-law, this is our first two types of cement slag volcanoes. The low-heat cement and the high-level water tank have relatively low strength and poor frost resistance, but what signal is it? What are your characteristics? In addition, there are two types of courses here, two kinds of cement are very special. Expand the internal heating type of cement. ..