CN115422785A - Method and device for determining permeability of component contact surface in RTM (resin transfer molding) simulation - Google Patents
Method and device for determining permeability of component contact surface in RTM (resin transfer molding) simulation Download PDFInfo
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- CN115422785A CN115422785A CN202211374022.5A CN202211374022A CN115422785A CN 115422785 A CN115422785 A CN 115422785A CN 202211374022 A CN202211374022 A CN 202211374022A CN 115422785 A CN115422785 A CN 115422785A
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Abstract
The embodiment of the application provides a method and a device for determining the permeability of a component contact surface in RTM (resin transfer molding) simulation, which are applied to the field of RTM (resin transfer molding) process simulation and are used for solving the technical problem of how to determine the permeability of the component contact surface, wherein the method comprises the following steps: the method comprises the steps of obtaining permeability and resin flow direction inside a contact part, determining an upstream node of a target contact point according to the resin flow direction, wherein the target contact point is a point on a contact surface of a first part and a second part, obtaining permeability of the upstream node, determining a limiting factor according to the resin flow direction, the permeability of the upstream node and the permeability inside the contact part, and determining the permeability of the target contact point according to the resin flow direction, the permeability of the upstream node, the permeability inside the contact part and the limiting factor, so that influence of the two parts and the flow direction on the permeability on the contact surface of the parts is considered at the same time, and the permeability of the resin at the target contact point is determined.
Description
Technical Field
The application relates to the field of RTM (resin transfer molding) process simulation, in particular to a method and a device for determining permeability of a component contact surface in RTM simulation.
Background
Resin Transfer Molding (RTM) is a process for injecting resin into a closed mold to wet a reinforcing material and cure, and is widely used in the design and manufacture of typical parts in the aerospace, aircraft, and weaponry industries. However, in the RTM process, the number of types and shapes of samples is large, and the final geometry of the sample to be formed is complicated, and a plurality of parts need to be layered separately. Therefore, how to determine the permeability of the contact surface between the components becomes an urgent technical problem to be solved in the field.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method and an apparatus for determining permeability of a component contact surface in RTM simulation, so as to determine permeability at an interface between components, and the specific scheme is as follows:
in a first aspect, an embodiment of the present application provides a method for determining permeability of a contact surface of a component in RTM simulation, where the method includes:
obtaining the permeability and the resin flow direction inside the contact part; the permeability inside the contact member includes a permeability inside the first member and a permeability inside the second member;
determining an upstream node of a target contact point according to the resin flow direction; the target contact point is a point on a contact surface of the first component and the second component;
acquiring the permeability of the upstream node;
determining a limiting factor based on the resin flow direction, the permeability of the upstream node, and the permeability of the interior of the contact member;
determining a permeability of the target contact point based on the resin flow direction, a permeability of the upstream node, a permeability of the contact member interior, and the limiting factor.
Optionally, the determining an upstream node of the target contact point according to the resin flow direction includes:
meshing the first component and the second component; the contact surface of the first component and the second component is positioned on the grid line;
determining the target contact point;
taking a grid point on the grid upstream of the target contact point as the upstream node according to the resin flow direction.
Optionally, the determining a limiting factor according to the resin flow direction, the permeability of the upstream node, and the permeability inside the contact member includes:
determining the limiting factor according to the following formula when the resin flow direction is from the second member to the first member;
determining the limiting factor according to the following formula when the resin flow direction is from the first member to the second member;
wherein f is the limiting factor,
is the permeability inside the first part,
is the permeability inside the second part,
is the permeability of the upstream node.
Optionally, the determining the permeability of the target contact point according to the resin flow direction, the permeability of the upstream node, the permeability inside the contact member, and the limiting factor includes:
determining a permeability formula corresponding to the resin flow direction;
determining a permeability of the target contact point based on the permeability equation, the permeability of the upstream node, the permeability inside the contact member, and the limiting factor.
Optionally, the determining a permeability equation corresponding to the resin flow direction includes:
determining a permeability of the target contact point according to the following formula when the resin flow direction is from the second member to the first member;
determining a permeability of the target contact point according to the following formula when the resin flow direction is from the first member to the second member;
wherein f is the limiting factor,
is the permeability of the interior of the first component,
is the permeability inside the second part,
is the permeability of the upstream node.
In a second aspect, an embodiment of the present application provides an apparatus for determining permeability of a contact surface of a component in RTM simulation, where the apparatus includes:
a data acquisition unit for acquiring a permeability and a resin flow direction inside the contact member; the permeability inside the contact member includes a permeability inside the first member and a permeability inside the second member;
a determination unit configured to determine an upstream node of a target contact point according to the resin flow direction; the target contact point is a point on a contact surface of the first component and the second component;
the data acquisition unit is further configured to acquire the permeability of the upstream node;
a calculation unit for determining a limiting factor based on the resin flow direction, the permeability of the upstream node, and the permeability inside the contact member; determining a permeability of the target contact point based on the resin flow direction, the permeability of the upstream node, the permeability of the contact member interior, and the limiting factor.
Optionally, the determining unit is specifically configured to:
meshing the first component and the second component; the contact surface of the first component and the second component is positioned on the grid line;
determining the target contact point;
taking a grid point on the grid upstream of the target contact point as the upstream node according to the resin flow direction.
Optionally, the computing unit is specifically configured to:
determining the limiting factor according to the following formula when the resin flow direction is from the second member to the first member;
determining the limiting factor according to the following formula when the resin flow direction is from the first member to the second member;
wherein f is the limiting factor,
is the permeability of the interior of the first component,
is the permeability inside the second part,
is the permeability of the upstream node.
Optionally, the computing unit is specifically configured to:
determining a permeability formula corresponding to the resin flow direction;
determining a permeability of the target contact point based on the permeability equation, the permeability of the upstream node, the permeability of the interior of the contact member, and the limiting factor.
Optionally, the computing unit is specifically configured to:
determining a permeability of the target contact point according to the following formula when the resin flow direction is from the second member to the first member;
determining a permeability of the target contact point according to the following formula when the resin flow direction is from the first member to the second member;
wherein f is the limiting factor,
is the permeability inside the first part,
is the permeability inside the second part,
is the permeability of the upstream node.
In a third aspect, an embodiment of the present application further discloses a computer-readable storage medium, where the computer-readable storage medium includes computer operating instructions, and when the computer operating instructions are executed on a computer, the computer is caused to execute any one of the above methods for determining component contact surface permeability in RTM simulation.
Compared with the prior art, the method has the following beneficial effects:
according to the method, the upstream node of the target contact point on the contact surface of the component is determined according to the resin flow direction, the limiting factor is determined according to the resin flow direction, the upstream node permeability and the permeability inside the contact component, and the permeability of the target contact point on the contact surface of the component is determined according to the determined limiting factor, the resin flow direction, the upstream node permeability and the permeability inside the contact component, so that the permeability of the target contact point is determined on the basis of considering the influence of the two components and the flow direction on the permeability on the contact surface of the component, and the calculation accuracy of the permeability on the contact surface is improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic diagram of a windward format in the prior art;
fig. 2 is a schematic flowchart of a method for determining permeability of a contact surface of a component in RTM simulation according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram illustrating a distribution of grid points between different components according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of an apparatus for determining permeability of a contact surface of a component in RTM simulation according to an embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
The terms "first," "second," "third," "fourth," and the like in the description and claims of this application and in the preceding drawings, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It will be appreciated that the data so used may be interchanged under appropriate circumstances such that the embodiments described herein may be practiced otherwise than as specifically illustrated or described herein. Moreover, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In the prior art method for determining the permeability of the contact surface between the components, as shown in fig. 1, when the flow direction of the resin is from point W to point E, point WW and point W are upstream nodes of point P, point P is a contact point on the target contact surface, the shaded portion of the left ellipse is the influence area of point W, the shaded portion of the right ellipse is the influence area of point E, and the left ellipse and the right ellipse have an overlapping area. However, the permeability determined by the method does not consider the influence of two components and the flow direction on the permeability, and the obtained component contact surface permeability is low in accuracy, wherein the component contact surface is a contact plane of two adjacent components.
As shown in fig. 2, an embodiment of the present application provides a method for determining component contact surface permeability in RTM simulation, where the method includes:
s201: obtaining the permeability and the resin flow direction inside the contact part; the permeability of the interior of the contact member includes a permeability of the interior of the first member and a permeability of the interior of the second member.
The internal permeability of a first part, the internal permeability of a second part, and the resin flow direction are obtained, wherein the first part and the second part are adjacent, and the first part and the second part have at least one contact surface. It should be noted that the resin flow direction can be directly obtained by simulation calculation.
S202: determining an upstream node of a target contact point according to the resin flow direction; the target contact point is a point on a contact surface of the first member and the second member.
An upstream node of a target contact point on a contact surface of the first member and the second member is determined based on a flow direction of the resin. For example, when the resin flow direction is from the first component to the second component, the point in the first component is an upstream node of the target contact point.
In an alternative embodiment, step S202 specifically includes:
s2021: meshing the first component and the second component; the contact surface of the first component and the second component is positioned on the grid line.
S2022: the target contact point is determined.
Any point on the contact surface of the first member and the second member is set as a target contact point.
S2023: taking a grid point on the grid upstream of the target contact point as the upstream node according to the resin flow direction.
After the target contact point is determined, the grid intersection points positioned at the upstream of the target contact point are determined to be upstream nodes according to the flow direction of the resin.
For ease of understanding, the following is exemplified:
as shown in fig. 3, the first member and the second member are divided into grids, the horizontal line of the point P is the contact surface of the first member and the second member, the shaded portion of the second member is the position of the filled resin in the second member, the flow of the resin is from the second member to the first member, and U is the upstream node of the point P on the grid.
S203: and acquiring the permeability of the upstream node.
After determining the upstream node of the target contact point, determining the permeability of the upstream node.
S204: a limiting factor is determined based on the resin flow direction, the permeability of the upstream node, and the permeability of the interior of the contact member.
And determining a limiting factor acquisition formula corresponding to the resin flow direction, and determining a limiting factor according to the upstream node permeability and the permeability in the contact part after the limiting factor acquisition formula is obtained.
In an optional embodiment, step S204 specifically includes:
determining the limiting factor according to the following formula when the resin flow direction is from the second member to the first member;
determining the limiting factor according to the following formula when the resin flow direction is from the first member to the second member;
wherein f is the limiting factor,
is the permeability inside the first part,
is the permeability inside the second part,
is the permeability of the upstream node.
By setting the respective restriction factor acquisition formula in accordance with the resin flow direction, the restriction factor takes into account both the two components and the influence of the resin flow direction on the permeability at the component contact face.
S205: determining a permeability of the target contact point based on the resin flow direction, the permeability of the upstream node, the permeability of the contact member interior, and the limiting factor.
In an alternative embodiment, step S205 specifically includes the following steps S2051-S2052.
S2051: a permeability equation corresponding to the resin flow direction is determined.
In an optional embodiment, step S2051 specifically includes:
determining a permeability of the target contact point according to the following formula when the resin flow direction is from the second member to the first member;
determining a permeability of the target contact point according to the following formula when the resin flow direction is from the first member to the second member;
wherein f is the limiting factor,
is the permeability inside the first part,
is the permeability inside the second part,
is the permeability of the upstream node.
The permeability calculation formula is in a first-order windward format when f =0, and in a central difference format with second-order accuracy when f = 1.
S2052: determining a permeability of the target contact point based on the permeability equation, the permeability of the upstream node, the permeability inside the contact member, and the limiting factor.
In an optional embodiment, the method further comprises: after determining the permeability of the contact surface, according to the formula
And calculating the resin flow speed of the contact surface. Where V is the contact surface resin flow rate, K is the contact surface permeability, μ is the resin viscosity, and p is the pressure, and the length of the resin filling time is calculated from the contact surface resin flow rate and the resin flow rate inside the part. Therefore, the length of the resin filling time is determined by calculating the flow speed of the resin, and whether the component is fully filled is judged according to the length.
The upstream node of the target contact point on the contact surface of the component is determined according to the resin flow direction, the limiting factor is determined according to the resin flow direction, the upstream node permeability and the permeability inside the contact component, and the permeability of the target contact point on the contact surface of the component is determined according to the determined limiting factor, the resin flow direction, the upstream node permeability and the permeability inside the contact component, so that the permeability of the target contact point is determined on the basis of simultaneously considering the influence of the two components and the flow direction on the permeability on the contact surface of the component, and the calculation accuracy of the permeability on the contact surface is improved.
As shown in fig. 4, an embodiment of the present application provides an apparatus for determining permeability of a contact surface of a component in RTM simulation, which specifically includes the following units:
a data acquisition unit 401 for acquiring permeability and resin flow direction inside the contact member; the permeability inside the contact member includes a permeability inside the first member and a permeability inside the second member;
a determination unit 402 configured to determine an upstream node of a target contact point according to the resin flow direction; the target contact point is a point on a contact surface of the first component and the second component;
the data obtaining unit 401 is further configured to obtain a permeability of the upstream node;
a calculation unit 403 for determining a limiting factor from the resin flow direction, the permeability of the upstream node and the permeability inside the contact member; determining a permeability of the target contact point based on the resin flow direction, a permeability of the upstream node, a permeability of the contact member interior, and the limiting factor.
In an alternative embodiment, the determining unit 402 is specifically configured to:
meshing the first component and the second component; the contact surface of the first component and the second component is positioned on the grid line;
determining the target contact point;
taking a grid point on the grid upstream of the target contact point as the upstream node according to the resin flow direction.
In an alternative embodiment, the computing unit 403 is specifically configured to:
determining the limiting factor according to the following formula when the resin flow direction is from the second member to the first member;
determining the limiting factor according to the following formula when the resin flow direction is from the first member to the second member;
wherein f is the limiting factor,
is the permeability of the interior of the first component,
is the permeability inside the second part,
is the permeability of the upstream node.
In another alternative embodiment, the calculating unit 403 is specifically configured to:
determining a permeability formula corresponding to the resin flow direction;
determining a permeability of the target contact point based on the permeability equation, the permeability of the upstream node, the permeability inside the contact member, and the limiting factor.
In another alternative embodiment, the computing unit 403 is specifically configured to:
determining a permeability of the target contact point according to the following formula when the resin flow direction is from the second member to the first member;
determining a permeability of the target contact point according to the following formula when the resin flow direction is from the first member to the second member;
wherein f is the limiting factor,
is the permeability of the interior of the first component,
is the permeability inside the second part,
is the permeability of the upstream node.
According to the method, the upstream node of the target contact point on the contact surface of the component is determined according to the resin flow direction, the limiting factor is determined according to the resin flow direction, the upstream node permeability and the permeability inside the contact component, and the permeability of the target contact point on the contact surface of the component is determined according to the determined limiting factor, the resin flow direction, the upstream node permeability and the permeability inside the contact component, so that the permeability of the target contact point is determined on the basis of considering the influence of the two components and the flow direction on the permeability on the contact surface of the component, and the calculation accuracy of the permeability on the contact surface is improved.
Embodiments of the present application provide a computer-readable storage medium, which includes computer operating instructions, when the computer operating instructions are executed on a computer, cause the computer to perform any one of the above methods for determining component interface permeability in RTM simulation.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for determining component interface permeability in RTM simulation, the method comprising:
obtaining the permeability and the resin flow direction inside the contact part; the permeability inside the contact member includes a permeability inside the first member and a permeability inside the second member;
determining an upstream node of a target contact point according to the resin flow direction; the target contact point is a point on a contact surface of the first component and the second component;
acquiring the permeability of the upstream node;
determining a limiting factor based on the resin flow direction, the permeability of the upstream node, and the permeability of the interior of the contact member;
determining a permeability of the target contact point based on the resin flow direction, the permeability of the upstream node, the permeability of the contact member interior, and the limiting factor.
2. The method of claim 1, wherein said determining an upstream node of a target contact point based on said resin flow direction comprises:
meshing the first component and the second component; the contact surface of the first component and the second component is positioned on the grid line;
determining the target contact point;
taking a grid point on the grid upstream of the target contact point as the upstream node according to the resin flow direction.
3. The method of claim 1, wherein determining a limiting factor as a function of the resin flow direction, the permeability of the upstream node, and the permeability of the contact member interior comprises:
determining the restriction factor according to the following formula when the resin flow direction is from the second member to the first member;
determining the limiting factor according to the following formula when the resin flow direction is from the first member to the second member;
wherein f is the limiting factor,
is the permeability of the interior of the first component,
is the permeability inside the second part,
is the permeability of the upstream node.
4. The method of claim 3, wherein said determining a permeability of the target contact point as a function of the resin flow direction, a permeability of the upstream node, a permeability of the contact member interior, and the limiting factor comprises:
determining a permeability formula corresponding to the resin flow direction;
determining a permeability of the target contact point based on the permeability equation, the permeability of the upstream node, the permeability of the interior of the contact member, and the limiting factor.
5. The method of claim 4, wherein determining a permeability equation corresponding to the resin flow direction comprises:
determining a permeability of the target contact point according to the following formula when the resin flow direction is from the second member to the first member;
determining a permeability of the target contact point according to the following formula when the resin flow direction is from the first member to the second member;
wherein f is the limiting factor,
is the permeability inside the first part,
is the permeability inside the second part,
is the permeability of the upstream node.
6. An apparatus for determining component interface permeability in an RTM simulation, the apparatus comprising:
a data acquisition unit for acquiring a permeability and a resin flow direction inside the contact member; the permeability inside the contact member includes a permeability inside the first member and a permeability inside the second member;
a determination unit configured to determine an upstream node of a target contact point according to the resin flow direction; the target contact point is a point on a contact surface of the first component and the second component;
the data acquisition unit is further configured to acquire the permeability of the upstream node;
a calculation unit for determining a limiting factor from the resin flow direction, the permeability of the upstream node, and the permeability inside the contact member; determining a permeability of the target contact point based on the resin flow direction, a permeability of the upstream node, a permeability of the contact member interior, and the limiting factor.
7. The apparatus according to claim 6, wherein the determining unit is specifically configured to:
meshing the first component and the second component; the contact surface of the first component and the second component is positioned on the grid line;
determining the target contact point;
taking a grid point on the grid upstream of the target contact point as the upstream node according to the resin flow direction.
8. The apparatus according to claim 6, wherein the computing unit is specifically configured to:
determining the limiting factor according to the following formula when the resin flow direction is from the second member to the first member;
determining the limiting factor according to the following formula when the resin flow direction is from the first member to the second member;
wherein f is the limiting factor,
is the permeability of the interior of the first component,
is the permeability inside the second part,
is the permeability of the upstream node.
9. The apparatus according to claim 8, wherein the computing unit is specifically configured to:
determining a permeability formula corresponding to the resin flow direction;
determining a permeability of the target contact point based on the permeability equation, the permeability of the upstream node, the permeability inside the contact member, and the limiting factor.
10. The apparatus according to claim 9, wherein the computing unit is specifically configured to:
determining a permeability of the target contact point according to the following formula when the resin flow direction is from the second member to the first member;
determining a permeability of the target contact point according to the following formula when the resin flow direction is from the first member to the second member;
wherein f is as defined aboveThe number of the limiting factors is such that,
is the permeability of the interior of the first component,
is the permeability inside the second part,
is the permeability of the upstream node.
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| CN101051019A (en) * | 2007-05-15 | 2007-10-10 | 北京航空航天大学 | Permeability detecting device and saturated permeability detecting method fiber spread layer surface and thickness direction |
| CN110261282A (en) * | 2019-07-23 | 2019-09-20 | 西南石油大学 | A kind of shearing seam shale core impulse attenuation permeability test method |
| US20220056798A1 (en) * | 2020-08-20 | 2022-02-24 | Saudi Arabian Oil Company | Determining matrix permeability of subsurface formations |
| CN114894693A (en) * | 2022-04-28 | 2022-08-12 | 河南理工大学 | Small-size rock core permeability testing method and device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101051019A (en) * | 2007-05-15 | 2007-10-10 | 北京航空航天大学 | Permeability detecting device and saturated permeability detecting method fiber spread layer surface and thickness direction |
| CN110261282A (en) * | 2019-07-23 | 2019-09-20 | 西南石油大学 | A kind of shearing seam shale core impulse attenuation permeability test method |
| US20220056798A1 (en) * | 2020-08-20 | 2022-02-24 | Saudi Arabian Oil Company | Determining matrix permeability of subsurface formations |
| CN114894693A (en) * | 2022-04-28 | 2022-08-12 | 河南理工大学 | Small-size rock core permeability testing method and device |
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