CN110514373A - A kind of mattress photoelastic evaluation method - Google Patents

A kind of mattress photoelastic evaluation method Download PDF

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Publication number
CN110514373A
CN110514373A CN201910550991.3A CN201910550991A CN110514373A CN 110514373 A CN110514373 A CN 110514373A CN 201910550991 A CN201910550991 A CN 201910550991A CN 110514373 A CN110514373 A CN 110514373A
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Prior art keywords
mattress
static pressure
stress relaxation
indicates
elasticity
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CN110514373B (en
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廖廷茂
任文
黄龙
徐毅
张强
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Guizhou Daziran Science & Technology Co Ltd
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Guizhou Daziran Science & Technology Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
    • G01M5/0041—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress
    • G01M5/005—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining deflection or stress by means of external apparatus, e.g. test benches or portable test systems

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  • Engineering & Computer Science (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention discloses a kind of mattress photoelastic evaluation methods.It carries out in the steps below: a, by mattress material sample static pressure；B, stress relaxation changes during recording static pressure, obtains tendency equation: ε=at+b；Wherein, parameter t indicates the static pressure time, and ε indicates stress relaxation, and a indicates that slope, b indicate stress relaxation when 0 moment；D, to more than one static pressure period △ tiInterior stress relaxation changes △ εiIt is weighted sum-average arithmetic, obtains weighted average δ, it may be assumed thatWherein, i indicates i-th of period △ ti, n indicates n △ tiTime point, fiIndicate that stress relaxation changes △ εiWeight；E, the elasticity of the elasticity for the δ value judgement mattress that basis acquires, δ value and mattress is in monotone decreasing relationship.The present invention establishes the quantization method of mattress elasticity, for traditional elastic evaluation method, evaluates more accurate.

Description

A kind of mattress photoelastic evaluation method
Technical field
The present invention relates to mattress testing field, especially a kind of mattress photoelastic evaluation method.
Background technique
As the improvement of people's living standards, people also more also pay attention to sleep quality, mattress currently on the market is big Mostly it is the homogeneous texture of single hardness elasticity, has been unable to meet people to the high request of sleep quality.In response to the market demand, at present There is customization mattress, it is fixed for user volume body mainly to acquire the information such as user's sleep habit, body data and sensory experience Corresponding mattress is made, to meet sleep need.With the rise of customization mattress, the section being unfolded around mattress various aspects of performance The activity of grinding is very more.The elastic index of mattress has important influence to the stress of human body, uses the material system that elasticity is good Make mattress to pressure sore is prevented, improving human vertebra stress comfort level has very positive effect.The material that elasticity is good, stress pine It relaxes smaller, when human body lies in mattress, persistently the power by small amplitude, is similar to " massage ", this is conducive to human body The circulation of blood improves the sleep quality of human body.The judge of mattress elasticity is mainly measured with falling-rebounding ball height currently on the market Index.This method is bigger by measurement material rigidity effects, not can truly reflect the elastic property of material.Such as: it will fall Ball is directly fallen on floor, and rebound height is often than on mattress or other elastic materials will be high.Using falling-rebounding ball side Method judges the mattress of viscoelastic material production, and evaluation result inaccuracy is scientific.
Summary of the invention
The object of the present invention is to provide mattress photoelastic evaluation methods.The present invention establishes the quantization side of mattress elasticity Method is evaluated more accurate for traditional elastic evaluation method.
A kind of technical solution of the present invention: mattress photoelastic evaluation method.It carries out in the steps below:
A, by mattress material sample static pressure；
B, stress relaxation changes during recording static pressure, obtains tendency equation:
ε=at+b；
Wherein, parameter t indicates the static pressure time, and ε indicates stress relaxation, and a indicates that slope, b indicate stress pine when 0 moment It relaxes；
D, to more than one static pressure period △ tiInterior stress relaxation changes △ εiIt is weighted sum-average arithmetic, is obtained Weighted average δ, it may be assumed that
Wherein, i indicates i-th of period △ ti, n indicates n △ tiTime point, fiIndicate that stress relaxation changes △ εi Weight；
E, the elasticity of the elasticity for the δ value judgement mattress that basis acquires, δ value and mattress is in monotone decreasing relationship.
In step a described in mattress photoelastic evaluation method above-mentioned, the mattress static pressure time is 2~3 hours.
In step a described in mattress photoelastic evaluation method above-mentioned, the Deformation Height of mattress material sample static pressure is mattress The 10% of material sample elemental height.
Compared with prior art, the present invention has found after having done lot of experiments to mattress elasticity, mattress elasticity with There are linear relationships between its stress relaxation；By the linear relationship, mattress can be obtained in the stress relaxation at each moment, later Sum-average arithmetic is weighted to stress relaxation ε again, obtains weighted average δ, is researched and analysed later by the δ value of various mattresses Obtain afterwards: the elasticity of weighted average δ and mattress is in monotone decreasing relationship；In this way, one can be obtained to mattress bullet Property quantization evaluation method, i.e., by δ value reflect mattress elasticity quality, i.e., when δ value is smaller, mattress elasticity is better.It establishes The assessment models of the unified quantization of mattress photoelastic evaluation, so that assessment result is more accurate.
In order to prove beneficial effect of the present invention, applicant carried out following experiments:
Experimental example 1.
Take mattress elasticity sensory evaluation difference it is big, specification be that 5 mattress material samples of 300*300*60mm carry out Static pressure analysis experiment；5 mattress material samples are respectively as follows:
Sample A: the 3D grid cloth as made from polyester fiber；
Sample B: it is formed, is bonded between Arenga engleri Beccari piece silk using natural emulsion, wherein Arenga engleri Beccari piece silk and day by Arenga engleri Beccari piece silk code is folded The weight ratio of right latex is 1: 2；
Sample C: it is formed, is bonded between Arenga engleri Beccari plate silk using natural emulsion, wherein Arenga engleri Beccari plate silk and day by Arenga engleri Beccari plate silk code is folded The weight ratio of right latex is 2: 1；
Sample D: being formed by coconut palm brown piece silk code is folded, coconut palm brown piece silk using low meldable fibre bonding, wherein coconut palm brown piece silk with it is low The weight ratio of meldable fibre is 1: 2；
Sample E: by molding 3060 sponge of foaming polyurethane material.
Resilient relationship between 5 mattress material samples are as follows: A > B > C > D > E.Due to 5 mattress materials Elastic difference between sample is larger, determines that the elastic size relation between each mattress can be obtained by sense organ.
Following static pressure test is carried out to above-mentioned 5 mattress material samples respectively, test method is as follows:
A, mattress material sample is used TM2101 testing machine static pressure 3 hours, the Deformation Height of mattress material sample static pressure It is the 10% of mattress material sample elemental height；
B, stress relaxation during record static pressure；
According to above-mentioned test method, the stress relaxation for obtaining each mattress material sample changes with time such as table 1；
Table 1
Trend analysis fitting is carried out to the data in table 1, obtains the tendency equation such as table 2 of each group mattress material sample.
Table 2
By the tendency equation of table 2, the stress relaxation value ε for choosing 1000 moment t to each mattress material sample is carried out It calculates；Then successively the latter of 1000 ε values is subtracted previous.Obtain the stress relaxation variation △ in 999 periods εi, △ ε is changed to 999 stress relaxationsiIt is weighted sum-average arithmetic, obtains weighted average δ；Each mattress material acquired The weighted average δ of sample such as table 3.
Table 3
Conclusion: as shown in Table 3, as the elasticity of mattress material sample is deteriorated, weighted average δ becomes larger therewith；That is, δ value Elasticity with mattress is in monotone decreasing relationship.
Experimental example 2.
The mattress material sample for taking mattress elasticity sensory evaluation close carries out static pressure test by the method for experimental example 1；Specifically Choose 3 groups of carry out static pressure tests；
1st group:
A1: the 3D grid cloth as made from polyester fiber；
A2: by the molding material of foamed latex；
2nd group:
B1: being formed by Arenga engleri Beccari plate silk code is folded, be bonded between Arenga engleri Beccari plate silk using natural emulsion, wherein Arenga engleri Beccari plate silk and natural The weight ratio of latex is 2: 1；
B2: being formed by Arenga engleri Beccari piece silk code is folded, be bonded between Arenga engleri Beccari piece silk using natural emulsion, wherein Arenga engleri Beccari piece silk and natural The weight ratio of latex is 2: 1；
3rd group:
C1: by molding 3060 sponge of foaming polyurethane material；
C2: it is formed by coconut palm plate silk code is folded, coconut palm plate silk is bonded using low meldable fibre, wherein coconut palm plate silk and low-heat The weight ratio of molten fiber is 2: 1.
The stress relaxation for obtaining each group mattress material sample changes with time such as table 4；
Table 4
Obtain the tendency equation such as table 5 of each group mattress material sample；
Table 5
Obtain the weighted average δ such as table 6 of each group mattress material sample；
Table 6
Conclusion: as shown in Table 6, the 1st group of two mattress material sample elasticity sensory evaluations are close, weighted average δ Also close to；2nd, 3 group of conclusion is identical with the 1st group.
By experimental example 1 and 2 it is found that present invention method that mattress elasticity is evaluated be actually consistent.Through the invention Method realize the quantitative analysis to mattress elasticity, it is more accurate to the photoelastic evaluation of mattress.
Specific embodiment
Below with reference to embodiment, the present invention is further illustrated, but is not intended as the foundation limited the present invention.
Embodiment 1.A kind of mattress photoelastic evaluation method carries out in the steps below:
A, by mattress material sample static pressure；
B, stress relaxation changes during recording static pressure, obtains tendency equation:
ε=at+b；
Wherein, parameter t indicates the static pressure time, and ε indicates stress relaxation, and a indicates that slope, b indicate stress pine when 0 moment It relaxes；
D, to more than one static pressure period Δ tiInterior stress relaxation changes delta εiIt is weighted sum-average arithmetic, is obtained Weighted average δ, it may be assumed that
Wherein, i indicates i-th of period Δ ti, n indicates n Δ tiTime point, fiIndicate stress relaxation changes delta εi Weight；
E, the elasticity of the elasticity for the δ value judgement mattress that basis acquires, δ value and mattress is in monotone decreasing relationship.
Specifically, in step a, the mattress static pressure time is 2~3 hours.
Specifically, in step a, the Deformation Height of mattress material sample static pressure is mattress material sample elemental height 10%.If it is thinner that value crosses fraction since some materials value crosses conference beyond test equipment ability to bear range Material deformation is very unobvious, after comprehensive consideration, takes 10% deflection.

Claims (3)

1. a kind of mattress photoelastic evaluation method, which is characterized in that carry out in the steps below:
A, by mattress material sample static pressure；
B, stress relaxation changes during recording static pressure, obtains tendency equation:
ε=at+b；
Wherein, parameter t indicates the static pressure time, and ε indicates stress relaxation, and a indicates that slope, b indicate stress relaxation when 0 moment；
D, to more than one static pressure period △ tiInterior stress relaxation changes △ εiIt is weighted sum-average arithmetic, is weighted Average value δ, it may be assumed that
Wherein, i indicates i-th of period △ ti, n indicates n △ tiTime point, fiIndicate that stress relaxation changes △ εiPower Weight；
E, the elasticity of the elasticity for the δ value judgement mattress that basis acquires, δ value and mattress is in monotone decreasing relationship.
2. mattress photoelastic evaluation method according to claim 1, it is characterised in that: in step a, the mattress static pressure time is 2 ~3 hours.
3. mattress photoelastic evaluation method according to claim 1, it is characterised in that: in step a, mattress material sample static pressure Deformation Height be mattress material sample elemental height 10%.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112378686A (en) * 2020-11-13 2021-02-19 大自然科技股份有限公司 Method for judging stability index of mattress support
CN112461655A (en) * 2020-11-13 2021-03-09 大自然科技股份有限公司 Method for judging mattress elasticity index
CN114441351A (en) * 2022-01-28 2022-05-06 江苏瑞构新型材料有限公司 Method for detecting abrasion degree of rubber strip of sealing door

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112378686A (en) * 2020-11-13 2021-02-19 大自然科技股份有限公司 Method for judging stability index of mattress support
CN112461655A (en) * 2020-11-13 2021-03-09 大自然科技股份有限公司 Method for judging mattress elasticity index
CN112378686B (en) * 2020-11-13 2024-03-12 大自然科技股份有限公司 Method for judging mattress support stability index
CN114441351A (en) * 2022-01-28 2022-05-06 江苏瑞构新型材料有限公司 Method for detecting abrasion degree of rubber strip of sealing door
CN114441351B (en) * 2022-01-28 2022-10-28 江苏瑞构新型材料有限公司 Method for detecting abrasion degree of rubber strip of sealing door

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