CN112668178B - Method for measuring physical properties of fabric in realistic garment simulation - Google Patents
Method for measuring physical properties of fabric in realistic garment simulation Download PDFInfo
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- CN112668178B CN112668178B CN202011564213.9A CN202011564213A CN112668178B CN 112668178 B CN112668178 B CN 112668178B CN 202011564213 A CN202011564213 A CN 202011564213A CN 112668178 B CN112668178 B CN 112668178B
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- 239000004744 fabric Substances 0.000 title claims abstract description 89
- 238000004088 simulation Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 16
- 230000000704 physical effect Effects 0.000 title claims description 22
- 238000005452 bending Methods 0.000 claims abstract description 38
- 238000005259 measurement Methods 0.000 claims abstract description 36
- 238000009864 tensile test Methods 0.000 claims abstract description 6
- 238000005520 cutting process Methods 0.000 claims abstract description 4
- 239000000725 suspension Substances 0.000 claims description 8
- 238000010409 ironing Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 4
- 230000001133 acceleration Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 5
- 238000004364 calculation method Methods 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 4
- 238000000691 measurement method Methods 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 2
- 239000004753 textile Substances 0.000 description 2
- 230000037303 wrinkles Effects 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 1
- 238000005094 computer simulation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000012826 global research Methods 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000013441 quality evaluation Methods 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000003685 thermal hair damage Effects 0.000 description 1
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Abstract
The invention discloses a fabric physical attribute measuring method in realistic clothing simulation, which comprises the following steps: preparing cloth, marking cloth lines with the same length along the weft direction, the warp direction and the diagonal direction of the cloth respectively, and cutting to obtain rectangular samples with the same size and shape; the sample comprises: weft samples, warp samples, and diagonal samples; mass measurement and thickness measurement; performing a bending test on the sample, and calculating the average bending strength of the sample; taking the sample for tensile testing and calculating the tensile strength of the sample; inputting the obtained physical attribute value into clothing simulation software to perform cloth simulation. The physical attribute data obtained by measurement and calculation of the invention improves the sense of reality of garment simulation.
Description
Technical Field
The invention relates to the technical field of cloth simulation, in particular to a method for measuring physical properties of fabrics in realistic garment simulation.
Background
Fabrics are complex, non-linear anisotropic materials that give different fabrics a unique appearance when draped, folded or wrinkled, making the behavior of the fabric difficult to describe and predict, and thus simulating the fabric is not easy. In order to more accurately simulate the behavior of fabrics, subjective assessment of drape and feel, etc., is often linked to objective performance.
The Kawabata evaluation system is a standardized fabric characterization method, which is verified by global research, but has not been widely used and popularized in practice because it is time-consuming and requires related expertise in analyzing the obtained data.
Because the three key parameters for the virtual simulation of the three-dimensional garment are the tensile stiffness, the shear stiffness and the bending stiffness, part of software suppliers develop own measuring devices aiming at the key parameters of the virtual simulation of the three-dimensional garment so as to manufacture a scientific substitute with low cost.
The Kawabata evaluation system is used by the foreign part of 3D software development suppliers to obtain the physical and mechanical properties required for simulating garments, while other companies develop their own measuring devices. Both cases aim to facilitate the user to digitize the mechanical and physical behaviour of their own material, whereas the correlation between the data of the different measuring systems is low.
In the group discussion of "consistency of drive accurate virtual simulation material measurements" at the 2017 berlin product innovation apparel conference (pitaarel), the expert group believes that there is no consistency between the methods used to measure fabric performance and the simulation results of different software packages on the same fabric. In practice, using different 3D software packages, there is also a great difference in simulation results between different software packages for the same fabric, and the material measurement lacks standardization.
At present, most of realistic garment simulation software in China is not provided with an accurate fabric physical property measurement method, is still in a theoretical discussion stage, is not enough in connection with practical application, and data measured by a traditional measuring instrument cannot be directly used in a simulation system of the software.
The specification with the publication number of CN 106333671A discloses a textile fabric physical property digital attribute simulation system and a measurement method, which aim to solve the problem that the simulation treatment of various surface types of fabric in the three-dimensional simulation design in the prior art is difficult to achieve a real effect; the fabric simulation software is installed in the computer system, and the fabric physical property measuring equipment, the fabric scanning system and the quality evaluation system are respectively connected with the computer system; the computer system is provided with a data output port, and various physical data during fabric measurement and data during fabric scanning can be operated through the computer system. The invention is mainly oriented to a computer simulation system, and various physical data and fabric scanning structures are obtained by connecting a test system with a computer, so that no targeted study is performed on the measurement of physical properties of fabrics.
The specification with publication number of CN 106333671A discloses a digital attribute simulation system and a measurement method for the physical characteristics of a textile fabric, wherein the simulation system comprises a computer system, fabric simulation software, fabric physical characteristic measurement equipment and a fabric scanning system; the fabric simulation software is installed in a computer system, and the fabric physical property measurement equipment and the fabric scanning system are respectively connected with the computer system; the computer system is provided with a data output port, and various physical data during fabric measurement and data during fabric scanning can be operated through the computer system. The invention is mainly aimed at calculating the physical data of the fabric and the data of scanning the fabric by a computer, and is not improved on the measurement method of the physical properties of the fabric.
Disclosure of Invention
The invention aims to provide a method for measuring physical properties of a fabric in realistic clothing simulation, and the data of the physical properties obtained by adopting the method ensures the authenticity of the fabric simulation and improves the overall quality of the clothing simulation.
A fabric physical property measuring method in realistic clothing simulation comprises the following steps:
(1) Preparing cloth, marking cloth lines with the same length along the weft direction, the warp direction and the diagonal direction of the cloth respectively, taking the cloth lines as the length direction, adopting the value of the same width, and cutting to obtain rectangular samples with the same size and shape; the sample comprises: weft samples, warp samples, and diagonal samples;
(2) Measuring the mass, weighing the sample, and calculating the average weight of the sample;
(3) Thickness measurement, namely performing thickness measurement on the sample, and calculating the average thickness of the sample;
(4) Bending strength measurement, namely bending the weft sample, the warp sample and the diagonal sample; calculating the average bending strength B of the weft sample, the warp sample and the diagonal sample:
(5) Tensile strength measurement: taking the weft sample, the warp sample and the diagonal sample for tensile test, and calculating the tensile strength of the weft sample, the warp sample and the diagonal sample;
(6) And inputting the six obtained physical attribute values into clothing simulation software to perform cloth simulation.
And (3) ironing the cloth to be measured at a low temperature in the step (1), ensuring that the cloth is completely free from wrinkles and thermal damage, and marking the cloth lines after the cloth is cooled, wherein the temperature of the low-temperature ironing is not more than 120 ℃.
Preferably, the rectangular sample size is 220mm×30mm, and the rectangular sample is used to facilitate bending strength measurement and tensile strength measurement.
Preferably, in the step (2), the mass of the sample is measured by using a fabric weight electronic balance, the weft sample, the warp sample and the diagonal sample are weighed together, and the average weight is calculated.
Preferably, the height-adjustable bending measuring instrument is adopted to carry out multiple overhang measurements on the sample, and the height of the bending measuring instrument is adjusted up and down to select different initial heights y i The bending strength is measured by using the bending measuring instrument, so that the error of manual measurement is reduced, the average bending strength is calculated, the experimental error is reduced, and the accuracy of measured values is ensured.
The calculation formula for calculating the average bending strength B of the sample in the step (4) is as follows:
wherein x is the extension length of the sample when the sample is hung, ρ is the linear density of the sample, and g is the gravitational acceleration; using n sets of different initial heights y i The sample is subjected to cloth hanging measurement, and the laying length l of each hanging time of the sample is input i Calculating to obtain bending strength B i The sample flexural strength B was averaged over n measurements.
Preferably, the sample has at least 5 sets of tensile forces in the weft, warp and diagonal directions, each set having a difference in value of greater than 0.02kgf.
In the step (6), the tensile strength of the sample is calculated by adopting the following formula:
wherein K is u ,K v ,K s Respectively represent the tensile elastic coefficients epsilon of the warp direction, the weft direction and the diagonal direction 1 ,ε 2 Representing the extension lengths of the weft and warp directions, respectively, F 1 ,F 2 Respectively represent the tension value in the warp direction and the weft direction, w Total (S) For the mass of the sample, L is the length of the sample in the clamp when measuring the tensile force, L Total (S) The total length of the sample is a to-be-solved parameter, a, b and c are all to-be-solved parameters, and f is a to-be-solved function.
Preferably, the six physical attributes of the step (7) include: bending strength of weft samples, bending strength of warp samples, bending strength of diagonal samples, tensile strength of weft samples, tensile strength of warp samples, and tensile strength of diagonal samples.
Compared with the prior art, the invention has the main advantages that:
1. and the height-adjustable bending measuring instrument is adopted to carry out multiple suspension measurement on the sample, so that the accuracy of measuring the bending strength value of the cloth is improved.
2. The original measurement data are converted into six physical attribute inputs required in the garment simulation software, so that the sense of reality of garment simulation is improved.
Drawings
FIG. 1 is a schematic flow chart of measuring and obtaining physical properties of a fabric according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the size and shape of the sample in S1 shown in FIG. 1;
FIGS. 3a and 3b are schematic views of the operation and structure of the highly variable bending gauge used in S4 of FIG. 1;
FIG. 4 is a photograph of a loop sheet suspension in an embodiment of the present invention;
FIG. 5 is a photograph of a terry loop suspension simulated using prior art methods in an embodiment of the present invention;
fig. 6 is a photograph of a loop sheet suspension simulated using the test method shown in fig. 1.
Detailed Description
As shown in fig. 1, the method for measuring the physical properties of the fabric in the realistic garment simulation comprises the following steps:
s1, preparing cloth, namely marking cloth lines with the same length along the weft direction, the warp direction and the diagonal direction of the cloth respectively, and cutting to obtain rectangular samples with the same size and shape by taking the cloth lines as the length direction and adopting values with the same width;
as shown in fig. 2, the sample includes: weft sample 1, warp sample 2, and diagonal sample 3;
s2, measuring the mass, weighing the sample, and calculating the average weight of the sample;
s3, measuring the thickness of the sample, performing thickness test on the sample, and calculating the average thickness of the sample;
s4, bending strength measurement, namely bending test is carried out on the weft sample 1, the warp sample 2 and the diagonal sample 3; calculating the average bending strength B of the weft sample 1, the warp sample 2 and the diagonal sample 3;
s5, measuring tensile strength, performing tensile test on the weft sample 1, the warp sample 2 and the diagonal sample 3, and calculating the tensile strength of the weft sample 1, the warp sample 2 and the diagonal sample 3;
s6, inputting the six obtained physical attribute values into clothing simulation software to perform cloth simulation.
Taking the knitted terry cloth shown in fig. 4 as an example, two square knitted terry cloths having the same side length of 40±2cm were prepared, and explanation will be made below:
step S1, taking one piece of knitted looped pile cloth, ironing at a low temperature, wherein the temperature of the low temperature ironing is not higher than 120 ℃, marking the length of a cloth thread with the same length as 220mm along the weft direction, the warp direction and the diagonal direction of the cloth after cooling, marking a rectangular area with a width value of 30mm, and obtaining three weft samples 1, warp samples 2 and diagonal samples 3 with the same size and shape by using a rotary cutter as shown in FIG. 2;
step S2, using a fabric weight electronic balance, weighing the weft sample 1, the warp sample 2 and the diagonal sample 3 together, and calculating the average weight;
step S3 is performed, in which the digital thickness gauge is calibrated before the test, three measurements are performed on different areas of the weft sample 1, the warp sample 2 and the diagonal sample 3, and the average value is calculated.
As shown in fig. 3a and 3b, step S4 is performed, in which the sample is placed on a horizontal table during measurement by a height-adjustable bending measuring instrument, the instrument height is adjusted up and down, and n sets of different initial heights y are used i The cloth overhang measurement is carried out on the sample, the knob is rotated to enable the sample to slowly descend to the bottom, the sample is lifted, the sliding block is slid, the extending part of the sample is tiled, and the tiling length l is recorded i The average bending strength B was calculated with the following formula:
wherein x is the extension length of the sample when the sample is hung, ρ is the linear density of the sample, and g is the gravitational acceleration; calculating to obtain bending strength B i The sample flexural strength B was averaged over n measurements.
Step S5, tensile strength measurement is carried out, the weft sample 1, the warp sample 2 and the diagonal sample 3 are subjected to tensile test, and the tensile strength of the samples is calculated by adopting the following formula:
wherein K is u ,K v ,K s Respectively represent the tensile elastic coefficients epsilon of the warp direction, the weft direction and the diagonal direction 1 ,ε 2 Representing the extension lengths of the weft and warp directions, respectively, F 1 ,F 2 Respectively represent the tension value in the warp direction and the weft direction, w Total (S) For the mass of the sample, L is the length of the sample in the clamp when measuring the tensile force, L Total (S) The total length of the sample is a to-be-solved parameter, a, b and c are all to-be-solved parameters, and f is a to-be-solved function.
And S6, inputting the six calculated physical attribute values into Style3D simulation software.
As shown in fig. 4, another square knitted terry cloth was fixed at two vertices to be naturally suspended to form wrinkles, and the visual appearance and outline of the cloth were somewhat different from the captured image because the diffuse reflectance and illumination condition of the cloth were not captured.
As shown in fig. 5 and 6, the suspension pattern when the objective measurement value and the physical property value are subjectively evaluated by inputting the terry cloth in the Style3D is observed, and the latter cloth suspension pattern is found to be more matched with the real photograph, so that the simulation sense of reality is improved.
Claims (6)
1. The method for measuring the physical properties of the fabric in the realistic garment simulation is characterized by comprising the following steps of:
(1) Preparing cloth, marking cloth lines with the same length along the weft direction, the warp direction and the diagonal direction of the cloth respectively, taking the cloth lines as the lengths, adopting values with the same width, and cutting to obtain rectangular samples with the same size and shape; the sample comprises: weft samples, warp samples, and diagonal samples;
(2) Measuring the mass, weighing the sample, and calculating the average weight of the sample;
(3) Thickness measurement, namely performing thickness measurement on the sample, and calculating the average thickness of the sample;
(4) Bending strength measurement, namely bending the weft sample, the warp sample and the diagonal sample; calculating the average bending strength B of the weft sample, the warp sample and the diagonal sample:
when the height-adjustable bending measuring instrument is used for measuring, a sample is placed on a horizontal table, the height of the instrument is adjusted up and down, and n groups of different initial heights y are adopted i For the sampleThe cloth overhang measurement is carried out, the knob is rotated to enable the cloth overhang measurement to slowly descend to the bottom, the sample is lifted, the sliding block is slid, the extending part of the sample is tiled, and the tiling length l is recorded i The average bending strength B was calculated with the following formula:
wherein x is the extension length of the sample during suspension, ρ is the linear density of the sample, g is the gravitational acceleration, and the bending strength B is calculated i Taking an average value of n times of measurement of the bending strength B of the sample;
(5) Measuring tensile strength, namely taking the weft sample, the warp sample and the diagonal sample for tensile test, and calculating the tensile strength of the weft sample, the warp sample and the diagonal sample;
the tensile strength of the sample was calculated using the following formula:
wherein Ku, kv, ks represent the tensile elastic coefficients in the warp, weft and diagonal directions, ε, respectively 1 ，ε 2 Representing the extension lengths of the weft and warp directions, respectively, F 1 ，F 2 Respectively represent the tension value in the warp direction and the weft direction, w Total (S) For the mass of the sample, L is the length of the sample in the clamp when measuring the tensile force, L Total (S) The total length of the sample is a to-be-solved parameter, a, b and c are all to-be-solved parameters, and f is a to-be-solved function;
(6) And inputting the six obtained physical attribute values into clothing simulation software to perform cloth simulation.
2. The method for measuring physical properties of fabric in realistic clothes simulation according to claim 1, wherein in the step (1), a fabric to be measured is ironed at a low temperature, the fabric is marked with a pattern after being cooled, and the temperature of the low temperature ironing is not more than 120 ℃.
3. The method for measuring physical properties of fabric in a realistic garment simulation according to claim 1, wherein in the step (2), the mass of the sample is measured by using a fabric weight electronic balance, and the weft sample, warp sample and diagonal sample are taken and weighed together, and then the average weight is calculated.
4. The method for measuring physical properties of fabric in realistic garment simulation according to claim 1, wherein the sample is subjected to multiple suspension measurements by using a height-adjustable bending measuring instrument, and the heights of the bending measuring instrument are adjusted up and down to select different initial heights.
5. The method for measuring physical properties of fabric in realistic garment simulation according to claim 1, wherein the tensile forces of the tensile test in the weft, warp and diagonal directions of the sample are selected to be at least 5 groups, and the values of the tensile forces of the groups are different by more than 0.02kgf.
6. The method for measuring physical properties of fabric in realistic garment simulation according to claim 1, wherein the six physical properties in step (7) comprise: bending strength of weft samples, bending strength of warp samples, bending strength of diagonal samples, tensile strength of weft samples, tensile strength of warp samples, and tensile strength of diagonal samples.
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| CN111177929A (en) * | 2019-12-31 | 2020-05-19 | 江西服装学院 | Textile fabric physical characteristic digital attribute simulation system and measuring method |
| CN111487249A (en) * | 2020-05-22 | 2020-08-04 | 浙江理工大学 | Method for testing bending anisotropy of garment fabric |
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2020
- 2020-12-25 CN CN202011564213.9A patent/CN112668178B/en active Active
Patent Citations (7)
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|---|---|---|---|---|
| WO1992014146A1 (en) * | 1991-02-12 | 1992-08-20 | De Montfort University | Method and apparatus for qualifying fabric |
| RU2119667C1 (en) * | 1996-04-30 | 1998-09-27 | Санкт-Петербургский государственный университет технологии и дизайна | Method for measuring drapeability of textiles |
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