The selective method of calculation because of the profitability is successfully applied several centuries. However when calculating non-failure operation in case of fatigue failures (often sudden) when there is a considerable sedate communication of m=10-15 for the supermulti-cycle field of loading between durability (hardness, an endurance limit) and the operating tension, decrease in the minimum resource of details will make 10-100 and more times. It turns out because of an unaccounted main part of population. In our example of 104-50=9950 pieces of such details, i.e. their potential refusals. Therefore for this case a selective method – the intermediate stage of calculations.

Keywords: selection, fatigue resource, population of final volume, sedate communication

dependences of value distribution of hardness of an armature of the class A500C of different diameters are constructed. For determination of the minimum values the method of graphic transition from selective data to set is used. Calculation of the smallest values of hardness using the shift received in the analysis of set is carried out.

Keywords: selection, armature, population of final volume

Researches of hardness of various steel grades for the purpose of determination of density of their distribution and distribution of extremes of selections are conducted. Results of the received researches are used for definition of a resource of details with use of a graphic method of transition from selection to set.

Keywords: selection, fatigue resource, population of final volume

Set forth in article method can be used when creating machines with guaranteed safe operation in case of possible large expenses for repairs. In the method used, the transition from selective statistical distributions (strength, loading and resource) to the parameters of the General population of finite volume. Absolute dependability is ensured if the resource (design) of parts and machines will be slightly larger than the first variational value of some aggregate. Approximate calculations showed that the increase in the price of the car is about 30% at absolute reliability of all machine parts.

Keywords: method, security, absolute reliability, safe operation, the totality of the final volume, the minimum design life, the allowable growth rates

This article describes the method of application of the General совокупносте final volume instead of custom information in the calculation of fatigue life of parts. For descriptions of statistical regularities used вероятсностные laws with a shift. The parameters of Weibull distribution are graphically.

Keywords: the General totality of the final volume, the sample resource calculation, fatigue

The article deals with the analysis of the application of the method of NS. Strelets for the static calculation of construction structures. It is proposed on the basis of the probabilistic-statistical method NS. Streletsky instead of the normal laws for operating voltages and strength apply laws with a shift, in particular, the law of the Weibull with three parameters and the Fisher-Тippet. It is proposed to make the transition to the parameters of the totality of the finite volume that will allow to increase the accuracy of calculation of probability of failure-free operation and the proposed probabilistic safety, and also to optimize the probability of trouble-free operation of construction structures

Keywords: optimization, design, construction, steel, sample, weibull, fisher-tippet

A comparison shift the aggregate final volume and minimum sample value, depending on model parameters for parts excavator. The studies revealed the following pattern: in the range of the Range R = 17-20 sets of the coefficients are significantly different from the values ​​of other Ranges.

Keywords: General population of finite volume, scope aggregate, shift the aggregate, the minimum sample value, selection.