CN103323339A - Grading method of size effect testing device set - Google Patents

Grading method of size effect testing device set Download PDF

Info

Publication number
CN103323339A
CN103323339A CN2013102341010A CN201310234101A CN103323339A CN 103323339 A CN103323339 A CN 103323339A CN 2013102341010 A CN2013102341010 A CN 2013102341010A CN 201310234101 A CN201310234101 A CN 201310234101A CN 103323339 A CN103323339 A CN 103323339A
Authority
CN
China
Prior art keywords
load
range
value
minimum
minimum load
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN2013102341010A
Other languages
Chinese (zh)
Other versions
CN103323339B (en
Inventor
杜时贵
吕原君
徐佩华
黄曼
张晓莺
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
University of Shaoxing
Original Assignee
University of Shaoxing
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by University of Shaoxing filed Critical University of Shaoxing
Priority to CN201310234101.0A priority Critical patent/CN103323339B/en
Publication of CN103323339A publication Critical patent/CN103323339A/en
Application granted granted Critical
Publication of CN103323339B publication Critical patent/CN103323339B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention provides a grading method of a size effect testing device set. The grading method comprises the following steps: 1) obtaining a minimum load F11 of a test by a scale test sample and load grading corresponding table, and obtaining an acknowledged range minimum load value F11min and a minimum load value F12min calculated by a relative error value; 2) determining a first-grade load range; 3) determining a second-grade load range; 4) determining a count-second-backwards-grade load range, namely repeating the processes in a reciprocated manner to obtain a count-second-backwards-grade maximum load Fp1max to determine a rage and a precision grade of the last grade and determining an acknowledged range minimum load value FQ1min of a force measuring system; determining the same relative error value which takes a test sample precision as the requirement and calculating a minimum load FQ2min by a range maximum value; 5) determining a minimum first-grade load range; if a determined minimum load FQ2min or FQ1min is less than or is close to a minimum value of a known test load range, finishing the grading. According to the grading method disclosed by the invention, the grading of a size effect testing device of structural surface shearing strength can be realized and the reliability is good.

Description

A kind of stage division of size effect test unit group
Technical field
The invention belongs to field of engineering technology, relate to a kind of stage division of size effect test unit group, be applicable to study a packet size sample and need to test the method for in the very large situation of minimax load ratio the test unit group being carried out grading design.
Background technology
Can there be size effect in many materials, namely along with the increase of structural plane size, there is certain variation tendency in its mechanical property, for the variation that obtains this multiscale materials modeling mechanical property need to the mechanical test of being correlated with of serial yardstick sample from small to large, still not have structural face shear strength size effect test unit stage division at present.Such as the stationary value that will obtain rock mass structural plane shearing strength, need carry out the direct shear test of the serial dimensional structure interview sample of some scale scope, the structural fece sample of getting n discrete specimen size carries out direct shear test, each specimen size has respectively m level load requirement, as shown in table 1, corresponding certain load value in each load rank of each yardstick sample.Generally speaking, there is certain load relation between each load rank, such as linear relationship.Each yardstick sample has maximum with minimum loading force, and the load range of one group of yardstick sample formation can be very large.
Table 1 yardstick sample table corresponding to the load rank
Figure BDA00003333632300011
In the test of carrying out multiple dimensioned sample, cause difference and the price factor of systematic error for avoiding the reasons such as machinery, satisfy a series of load of whole multiple dimensioned samples all in certain accuracy rating with a bench teat experiment device as far as possible.But, generally reach 100 when above when the be divided by load ratio that obtains of minimum and maximum load, a unrenewable bench teat experiment device is realized the test of all load, and this is because the error of control system, dynamometric system and loading system that every one-level TT﹠C system comprises has consisted of an overall accuracy and useful load scope.The useful load scope relates to the impact of the factors such as relative error value, anti-interference, dynamic stability.Generally speaking, increase with interior relative error less than 1% of full scale very fast, as shown in Figure 1.Need test unit is carried out the loading that reasonable classification realizes a series of load of multiple dimensioned sample for this reason.
In sum, need to realize testing requirements for load ratio by test unit being carried out classification greater than the dynamometric system of 100 above load range.Also need to consider the problems such as classification cost, operability, load checking in the classification process.For this reason, reasonably designing a kind of test unit component level method satisfies load ratio and becomes key issue greater than the test of the yardstick sample of 100 above load range.
Summary of the invention
The deficiencies such as the test space that systematic error is large, the testing equipment cost is high, the shared utilization factor large, the place, laboratory that existing many bench teats experiment device produces is low in order to overcome, poor operability the invention provides the stage division of the good size effect test unit group of the classification of a kind of implementation structure face shearing strength size effect test unit, reliability.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of stage division of size effect test unit group, described stage division comprises the steps:
1) minimum load that is obtained testing by yardstick sample table corresponding to the load rank is F 11, maximum load is F Nm, load range: F 11～F Nm, with maximum load value F NmFor range F is determined in reference 1And accuracy class, F 1〉=F Nm
The range minimum load value of generally acknowledging is the minimum value F of range effective range 11min, be x% with the precision of seasonal dynamometric system, the load maximum relative error value of sample testing is y%.Obtain minimum load value F 12min, wherein, F 12min=x% * F 1/ y%;
2) first order load range is determined: the range minimum load value F that generally acknowledges 11minWith the minimum load value F that calculates with the relative error value 12minCompare, if F 11min＜F 12min, with F 12minMinimum load as this one-level; If F 11minF 12min, with F 11minAs the minimum load of this one-level, this one-level is the rank of largest control system, is defined as the first order;
3) second level load range is determined: take the selected minimum load value of the first order as reference, determine second level maximum load value F 2max, F wherein 2maxMinimum load value, at this moment F 2maxWith F 11minBetween load poor be exactly the load overlay region that the first order and the second level are used for verifying, by the load overlay region load proportion is set, the ratio of any two inter-stages with this as a reference;
The maximal value F that obtains according to the second level 2maxDetermine range and the accuracy class of the second level, and confirm the generally acknowledged range minimum load value F of this dynamometric system 21min, determine the same relative error value take the sample precision as requirement, calculate minimum load F by the range maximal value 22min
The range minimum load value F that generally acknowledges 21minWith the minimum load value F that calculates with the relative error value 22minCompare, if F 21min＜F 22min, with F 22minMinimum load as this one-level; If F 21minF 22min, with F 21minAs the minimum load of this secondary, this one-level is the rank of the second bench control system, is defined as the second level;
4) the penultimate stage load range is determined: the maximum load F that realizes and so forth penultimate stage P1maxDetermine range and the accuracy class of afterbody, and confirm the generally acknowledged range minimum load value F of this dynamometric system Q1min, determine the same relative error value take the sample precision as requirement, calculate minimum load F by the range maximal value Q2min
5) minimum one-level load range is determined: the range minimum load value F that generally acknowledges Q1minWith the minimum load value F that calculates with the relative error value Q2minCompare, if F Q1min＜F Q2min, with F Q2minMinimum load as this one-level; If F Q1minF Q2min, with F Q1minMinimum load as afterbody;
The minimum load F that determines Q2minOr F Q1minIf near the minimum value of known test load range, classification is complete less than also;
The minimum load F that determines Q2minOr F Q1minIf less than but differ minimum load F large or that determine with the minimum value of known test load range Q2minOr F Q1minGreater than the minimum value of known test load range, then return the load proportion that step 3) is readjusted the overlay region, so that the minimum load F that determines Q2minOr F Q1minIf near the minimum value of known test load range, classification is complete less than also.
Further, described step 2) in, if F 11minWith F 12minDiffer larger, adjust the accuracy class of dynamometric system.
Beneficial effect of the present invention is mainly manifested in: the size effect test unit of material mechanical performance can solve an existing bench teat experiment device can not satisfy the problems such as specimen test precision, provide a kind of effective stage division to improve test result reliability, had larger implementary value and economic results in society.
Description of drawings
Fig. 1 is the curve synoptic diagram of load and relative error.
Fig. 2 is a kind of process flow diagram of stage division of size effect test unit group, and wherein, a is the flow process of forward part, (b) is the flow process at rear portion.
Embodiment
Below the invention will be further described.
With reference to Fig. 2, a kind of stage division of size effect test unit group comprises the steps:
1). the minimum load of test is F as shown in Table 1 11, maximum load is F Nm, load range: F 11～F Nm(KN), with maximum load value F NmFor range F is determined in reference 1(F 1〉=F Nm) and accuracy class.Confirm generally acknowledged range minimum load value, i.e. the minimum value F of this range effective range by factors such as precision, stability, anti-interferences 11minPrecision with seasonal dynamometric system is x%, and the load maximum relative error value of sample testing is y%.Then can obtain minimum load F 12minWherein, F 12min=x% * F 1/ y%.
2). first order load range is determined: the range minimum load value F that generally acknowledges 11minWith the minimum load value F that calculates with the relative error value 12minCompare.If F 11min＜F 12min, with F 12minMinimum load as this one-level; If F 11minF 12min, with F 11minMinimum load as this one-level.This one-level is the rank of largest control system, is defined as the first order.If F 11minWith F 12minDiffer larger, adjust the accuracy class of dynamometric system, to reduce cost.
3). second level load range is determined: with the selected minimum load value F of the first order 11min(or F 12min) be reference, determine second level maximum load value F 2max, F wherein 2maxF 11min(or F 12min).This moment F 2maxWith F 11minBetween load poor be exactly the load overlay region that the first order and the second level are used for verifying.The load overlay region can arrange certain load proportion, and the ratio of any two inter-stages with this as a reference.
The maximal value F that obtains according to the second level 2maxDetermine range and the accuracy class of the second level, and confirm the generally acknowledged range minimum load value F of this dynamometric system 21minDetermine the same relative error value take the sample precision as requirement, calculate minimum load F by the range maximal value 22min
The range minimum load value F that generally acknowledges 21minWith the minimum load value F that calculates with the relative error value 22minCompare.If F 21min＜F 22min, with F 22minMinimum load as this one-level; If F 21minF 22min, with F 21minMinimum load as this secondary.This one-level is the rank of the second bench control system, is defined as the second level.
4). the penultimate stage load range is determined: the maximum load F that realizes and so forth penultimate stage P1maxDetermine range and the accuracy class of afterbody, and confirm the generally acknowledged range minimum load value F of this dynamometric system Q1minDetermine the same relative error value take the sample precision as requirement, calculate minimum load F by the range maximal value Q2min
5). minimum one-level load range is determined: the range minimum load value F that generally acknowledges Q1minWith the minimum load value F that calculates with the relative error value Q2minCompare.If F Q1min＜F Q2min, with F Q2minMinimum load as this one-level; If F Q1minF Q2min, with F Q1minMinimum load as afterbody.The minimum load F that determines Q2minOr F Q1minIf near the minimum value of known test load range, classification is complete less than also; The minimum load F that determines Q2minOr F Q1minIf less than but differ larger or definite minimum load F with the minimum value of known test load range Q2minOr F Q1minGreater than the minimum value of known test load range, from the load proportion of new adjustment overlay region, so that the minimum load F that determines Q2minOr F Q1minIf less than and near the minimum value of known test load range.Classification is complete.
In the present embodiment, in the useful load scope situation of known multiple dimensioned sample, in order to solve maximum load and minimum load ratio above the problem more than 100, need to adopt stage division to the serial load test of multiple dimensioned sample.Rationally confirmed test device component level method is the prerequisite that improves size effect mechanical property test reliability, the invention provides that a kind of principle is clear and definite, workable, with low cost, the size effect test unit component level method of good practical effect.Test unit component level method is take the precision of TT﹠C system in usable range as dividing foundation.
Example: the load range of the known yardstick sample that need to test is 2KN-1000KN.The range effective range of dynamometric system is 10%-100%, and the load maximum relative error value of sample testing is that y% is 5%.
1. first order load range is determined: the range according to the selected dynamometric system of maximum load value 1000KN is 1000KN, and the dynamometric system precision is 0.5%FS.
Determine that according to the range effective range 100KN is the acknowledged small-range, calculating minimum load according to the requirement of relative error 5% is 100KN.The minimum load that the acknowledged small-range equals to calculate, hence one can see that 100KN is as the minimum load of the first order.
Take 100KN as the maximum load 200KN with reference to definite second level, wherein 100KN-200KN is the load overlay region, and the load ratio of overlay region (200-100)/1000 is 10%.
2. second level load range is determined: the range according to the selected dynamometric system of maximum load value 200KN is 200KN, and accuracy class is 0.05%.
Determine that according to the range effective range 20KN is the acknowledged small-range, calculating minimum load according to the accuracy class of relative error requirement and dynamometric system is 0.2KN.The acknowledged small-range is greater than the minimum load of calculating, and hence one can see that 20KN is as the minimum load of the second level.This accuracy class is higher, can reduce precision and adjust to 0.1%, and the minimum load of this moment is 4KN.
Take 20KN as the maximum load 40KN with reference to definite third level, wherein 20KN-40KN is the load overlay region, and the load ratio of overlay region (40-20)/200 is 10%.
3. third level load range is determined: the range according to the selected dynamometric system of maximum load value 40KN is 40KN, and accuracy class is 0.1%.
Determine that according to the range effective range 4KN is the acknowledged small-range, calculating minimum load according to the accuracy class of relative error requirement and dynamometric system is 0.8KN.The acknowledged small-range is greater than the minimum load of calculating, and hence one can see that 4KN is as the minimum load of the third level.
Range according to the selected dynamometric system of maximum load value 4KN is 6KN, and accuracy class is 0.1%.Take 4KN as the maximum load 8KN with reference to definite afterbody, wherein 4KN-8KN is the load overlay region, and the load ratio of overlay region (8-4)/40 is 10%.
4. the afterbody load range is determined: the range according to the selected dynamometric system of maximum load value 8KN is 8KN, and accuracy class is 0.1%.
Determine that according to the range effective range 0.8KN is the acknowledged small-range, calculating minimum load according to the accuracy class of relative error requirement and dynamometric system is 0.16KN.The acknowledged small-range is greater than the minimum load of calculating, and hence one can see that 0.8KN is as the minimum load of afterbody.This minimum load has satisfied desired test load minimum value 2KN.Classification is complete.

Claims (2)

1. the stage division of a size effect test unit group, it is characterized in that: described stage division comprises the steps:
1) minimum load that is obtained testing by yardstick sample table corresponding to the load rank is F 11, maximum load is F Nm, load range: F 11～F Nm, with maximum load value F NmFor range F is determined in reference 1And accuracy class, F 1〉=F Nm
The range minimum load value of generally acknowledging is the minimum value F of range effective range 11min, be x% with the precision of seasonal dynamometric system, the load maximum relative error value of sample testing is y%.Obtain minimum load value F 12min, wherein, F 12min=x% * F 1/ y%;
2) first order load range is determined: the range minimum load value F that generally acknowledges 11minWith the minimum load value F that calculates with the relative error value 12minCompare, if F 11min＜F 12min, with F 12minMinimum load as this one-level; If F 11minF 12min, with F 11minAs the minimum load of this one-level, this one-level is the rank of largest control system, is defined as the first order;
3) second level load range is determined: take the selected minimum load value of the first order as reference, determine second level maximum load value F 2max, F wherein 2maxMinimum load value, at this moment F 2maxWith F 11minBetween load poor be exactly the load overlay region that the first order and the second level are used for verifying, by the load overlay region load proportion is set, the ratio of any two inter-stages with this as a reference;
The maximal value F that obtains according to the second level 2maxDetermine range and the accuracy class of the second level, and confirm the generally acknowledged range minimum load value F of this dynamometric system 21min, determine the same relative error value take the sample precision as requirement, calculate minimum load F by the range maximal value 22min
The range minimum load value F that generally acknowledges 21minWith the minimum load value F that calculates with the relative error value 22minCompare, if F 21min＜F 22min, with F 22minMinimum load as this one-level; If F 21minF 22min, with F 21minAs the minimum load of this secondary, this one-level is the rank of the second bench control system, is defined as the second level;
4) the penultimate stage load range is determined: the maximum load F that realizes and so forth penultimate stage P1maxDetermine range and the accuracy class of afterbody, and confirm the generally acknowledged range minimum load value F of this dynamometric system Q1min, determine the same relative error value take the sample precision as requirement, calculate minimum load F by the range maximal value Q2min
5) minimum one-level load range is determined: the range minimum load value F that generally acknowledges Q1minWith the minimum load value F that calculates with the relative error value Q2minCompare, if F Q1min＜F Q2min, with F Q2minMinimum load as this one-level; If F Q1minF Q2min, with F Q1minMinimum load as afterbody;
The minimum load F that determines Q2minOr F Q1minIf near the minimum value of known test load range, classification is complete less than also;
The minimum load F that determines Q2minOr F Q1minIf less than but differ minimum load F large or that determine with the minimum value of known test load range Q2minOr F Q1minGreater than the minimum value of known test load range, then return the load proportion that step 3) is readjusted the overlay region, so that the minimum load F that determines Q2minOr F Q1minIf near the minimum value of known test load range, classification is complete less than also.
2. the stage division of a kind of size effect test unit group as claimed in claim 1 is characterized in that: described step 2), if F 11minWith F 12minDiffer larger, adjust the accuracy class of dynamometric system.
CN201310234101.0A 2013-06-09 2013-06-09 Grading method of size effect testing device set Active CN103323339B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201310234101.0A CN103323339B (en) 2013-06-09 2013-06-09 Grading method of size effect testing device set

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201310234101.0A CN103323339B (en) 2013-06-09 2013-06-09 Grading method of size effect testing device set

Publications (2)

Publication Number Publication Date
CN103323339A true CN103323339A (en) 2013-09-25
CN103323339B CN103323339B (en) 2015-07-15

Family

ID=49192226

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201310234101.0A Active CN103323339B (en) 2013-06-09 2013-06-09 Grading method of size effect testing device set

Country Status (1)

Country Link
CN (1) CN103323339B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104090068A (en) * 2014-01-03 2014-10-08 力合科技（湖南）股份有限公司 Self-adaption method for measuring range of detection instrument
CN106442132A (en) * 2016-09-13 2017-02-22 中国北方发动机研究所(天津) Method for testing mechanical property of thin-wall region of diesel engine block

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060027451A (en) * 2004-09-23 2006-03-28 안태훈 The method of rock mass classification in the design of tunnel using multivariate discriminant analysis
CN1815170A (en) * 2006-02-24 2006-08-09 浙江建设职业技术学院 Method for determining in dimension shear-strength size effect of rock structural face
CN103065051A (en) * 2012-12-31 2013-04-24 中国铝业股份有限公司 Method for performing grading and sectionalizing on rock mass automatically

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20060027451A (en) * 2004-09-23 2006-03-28 안태훈 The method of rock mass classification in the design of tunnel using multivariate discriminant analysis
CN1815170A (en) * 2006-02-24 2006-08-09 浙江建设职业技术学院 Method for determining in dimension shear-strength size effect of rock structural face
CN103065051A (en) * 2012-12-31 2013-04-24 中国铝业股份有限公司 Method for performing grading and sectionalizing on rock mass automatically

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
ALBERTO CARPINTERI等: ""A stereological analysis of aggregate grading and size effect on concrete tensile strength"", 《INTERNATIONAL JOURNAL OF FRACTURE》, vol. 128, 31 December 2004 (2004-12-31), pages 233 - 242, XP019241735, DOI: doi:10.1023/B:FRAC.0000040986.00333.86 *
尹红梅等: ""工程岩体分级研究综述"", 《长江科学院院报》, vol. 28, no. 8, 31 August 2011 (2011-08-31) *
章仁友等: ""岩体结构面力学行为的尺寸效应研究"", 《地质科技情报》, vol. 12, no. 8, 30 June 1993 (1993-06-30), pages 97 - 103 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104090068A (en) * 2014-01-03 2014-10-08 力合科技（湖南）股份有限公司 Self-adaption method for measuring range of detection instrument
CN106442132A (en) * 2016-09-13 2017-02-22 中国北方发动机研究所(天津) Method for testing mechanical property of thin-wall region of diesel engine block

Also Published As

Publication number Publication date
CN103323339B (en) 2015-07-15

Similar Documents

Publication Publication Date Title
Garrison-Kimmel et al. Star formation histories of dwarf galaxies in the FIRE simulations: dependence on mass and Local Group environment
Ludlow et al. The mass–concentration–redshift relation of cold and warm dark matter haloes
CN104237965B (en) shale oil resource evaluation method and device
Manzanal et al. Generalized plasticity state parameter‐based model for saturated and unsaturated soils. Part 1: Saturated state
Gabr et al. Repeated load triaxial testing of recycled concrete aggregate for pavement base construction
CN107328919B (en) Mine slope On Engineering Stability Classification of Rock Masses analysis method
Fratanduono et al. Hugoniot experiments with unsteady waves
CN102637237A (en) Ecological resource bearing model method for urban and rural ecological planning
Yu et al. Analysis of soil-steel bar mat pullout models using a statistical approach
CN103323339B (en) Grading method of size effect testing device set
Stoecklin et al. Controlling factors for post-failure evolution of subaqueous landslides
Rastegarnia et al. Assessment of the engineering geological characteristics of the Bazoft dam site, SW Iran
CN103559388A (en) Method for building fine grain tailing project property index estimation empirical formula based on multi-element stepwise regression
Shi et al. Meso-structural evaluation of asphalt mixture based on pore cellular structure model
CN103335910B (en) A kind of structural face shear strength size effect test unit Non-inferiority test method
Zhou et al. A damping modification factor prediction model for horizontal displacement spectrum from subduction slab earthquakes in Japan accounting for site conditions
Fei et al. Comparison of direct shear and simple shear responses of municipal solid waste in USA
Niu et al. Identifying modal parameters of a multispan bridge based on high-rate GNSS–RTK measurement using the CEEMD–RDT approach
Xiao et al. Dynamic behaviour and constitutive model of concrete at different strain rates
CN101894182B (en) Method for accurately acquiring section form of beam structure and corresponding sectional dimension data
Yeo Multiple points-in-time estimation of peak wind effects on structures
Cami et al. Probabilistic analysis of a tailings dam using 2D composite circular and non-circular deterministic analysis, SRV approach, and RLEM
CN103344510B (en) Based on the structural face shear strength size effect method of testing of multiple stage direct shear test instrument
CN103344506A (en) Combined test apparatus and method for structural surface shear strength size effect
CN104359772A (en) Method for determining normal stress threshold value of peak friction angles of rock mass structural planes

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
C10 Entry into substantive examination
SE01 Entry into force of request for substantive examination
C14 Grant of patent or utility model
GR01 Patent grant